OP. If you are still around or for anyone in a similar situation, I feel I have to share this.
Don't put too, too much into what is said on Internet boards. Why? Well, b/c only YOU can decide if you have the "fire in the belly." If you don't make an honest try of it, you will never know, and that may be harder to live with than a rejection. No one can really know individuals here and what they are all about. People draw conclusions based on what you share. Are there those that have insight to some degree? Yes! Yes! But they do not know you and your particulars. You can only put so much into the responses given to you online. Most of your decision has to come from critical evaluation--coming from you--and coming from what is required for med school admission.
Some folks that have gone through the process have become chagrin by it. And this is where I feel strong insight into medicine, from the get-go--clinically speaking--is most important--maybe even more important than GPAs and MCAT scores. How can you tell people of all the lackluster aspects of medical education and the work itself--especially given the glamorized view of the field by way of television, movies, or books? Much of medicine is
just plain grubby and exhausting. I have worked very closely with those that have tasted this, and have also tasted of it in my field-specialty. If you work enough clinically, you can't miss it--if you have any ability to see reality at all.
My point is that you can get a fair number of negatives from folks who have been or are going through the process of becoming physicians--especially if it fell very short of their expectations; which often, for many that have gone through medical education, it has. Healthcare in general has a lot of suckage. So for med school, to put all the money, time, and energy into a field when it seems to fall short of expectations and when one is up against all that that suckage is beyond frustrating to some. And then there are just those that have resigned themselves to seeing the down-side of everything--some of them are even quite humorous in sharing it--but b/c life falls short of some utopia, they see primarily the suckage.
I only put so much into what is shared on the boards here, even with those I respect; b/c there are a lot of dynamics that make up responses from people.
So, I say, if you are still interested, keep moving forward, and find a way to make the determination for yourself after you have done all the homework.
Sure, listen to experienced others, but also keep in mind that
they don't know the whole you and what you have to offer. What sucks most for you is that you were in med school before--to which adcom committee members will reason:
The best predictor of future behavior is past behavior. Thus, it is incumbent upon you, the individual applicant, to show a pattern of positive change from which the members can strive to give a more balanced evaluation. Is it still a risk after that?
YES! Not even everyone with a 4.0 and MCAT of >/= 40 gets into medical school. The statistics may be in their favor, but it's still a bit of a crap shoot. There is no perfect equation by which one obtains entrance to medical school. All you can do is your absolute best in showing you have made changes in a positive direction. It's no different than interviewing and applying for any number of jobs/positions. You have got to go to the interview, putting your best foot forward; but you do not know the "fit" or qualifications of all the other interviewees before or after you. Should that stop you from applying and hopefully interviewing? NO. Absolutely not.
I realize most may not know of this psychologist, Dr. Cloud, But I have found some of his work helpful. So here is what he says with regard to highly successful people:
"Successful people never again… Return to what hasn’t worked. Whether a job, or a broken relationship that was ended for a good reason, we should never go back to the same thing, expecting different results,
without something being different- See more at:
http://www.success.com/article/10-things-successful-people-never-do-again#sthash.V6B47Ehy.dpuf
So, to your original query, here are some more: What has changed? What is different? What is the new positive pattern, and how well is it demonstrated?"
If you are going to put yourself out there, and that is what medical school and education is---really, really putting yourself out there in the extreme--can you demonstrate a phenomenal change that would cause people on an adcom committee to give you another chance, given all the applicants that haven't had the chance in the first place???? There's no dancing around this. It's the big elephant in the room. If you can demonstrate this, pick your numbers and pull the lever. When there are a lot of applicants, it puts even the best candidates at risk for not winning the medical-school-admission-lottery. Regardless, at the end of the day, if you don't apply (play) you can't win. It's about optimizing your chances given the applicant pool.
Finally, be sure for you--yourself-- that this is what you want--that way your motivation will not be hampered by other people's opinions, which are often influenced by their own experiences and feelings. They might be speaking from experience; but they may also feel a sense of let-down, when the role they have pursued doesn't meet their expectations.
At the end of the day, only the individual person can make the decision of whether or not he or she should apply. It's about what you want and what you can demonstrate. Are there risks? Do you have to mitigate your losses and put your best foot forward? Yes and yes. As in getting a particular job, however, you must do your due diligence and go to the interview, or you definitely won't get the job.
I don't put a lot about my specifics on here; b/c while there are folks that can give good insight, they don't know all of my particulars. When my application is complete and ready to go forth, I will send each one to where they ought to go, and move forward from there. All you can do is your best application. After that, it's up to God and the universe, so to speak. You don’t know if you don’t do the work and try.
The only thing holding you back is yourself. Yes being an older non-trad is a bit more difficult to get back in, but your life has been enriching and will only benefit your perspective on medicine. I think the biggest hurdle is going to be the MCAT. You have to score solid on that to prove you're ready for this. 
