I don't understand your post after the first sentence, but I'm going to be the first to advise against mentioning it in your personal statment. Its not even that there's discrimination or a stigma or whatever, it just comes down to the fact that medical schools want to graduate all of the students that they accept. They don't want students failing (or as is more often the case, dropping) out. I don't have numbers to back this up, but I'll bet dollars to donuts that in this day and age the most common reason for not finishing med school is mental illness, and I know that deans of admission can all think of those handful of students who didn't make it because of psychiatric issues.
Let me make this clear--adcoms would like this information on all of their applicants but can't get it because its not a question that's easy to ask. Don't make it easier for them to not let you in by volunteering that information.
I am NOT saying that you can't make it through medical school having a history of depression. I'm not saying there aren't excellent medical students and physicians who suffer from mental illness. I'm just saying that from an adcoms point of view, a history of mental illness is soemthing that increases, however marginally, the chance that you won't graduate.
Unless you've written a personal statement that REALLY spins it into a positive, and something that is essential to making you a great doctor, I can only see it hurting you to mention it.
I say leave it out, good luck!