Okay, I think I can answer most of your questions. I dropped out of pharmacy school, AFTER I've already started so my GPA was a bit lowered. (I had 3.08 in p school) but my undergrad GPA was 3.93. I was really late into the research on pharmacy school, and it wasn't SDN that convinced me to drop, it was my school itself. Portrayal of the future profession was weak, and the dean forced meetings on us to tell us stuff like, how great we are, how much the school has grown despite not getting that much funds, pointless drivel. We were all told to do PGY's to secure jobs. We were even told that it was hard to get a job now (One teacher told us over 40 people applied to a well known chain and only 4 people got it last year. Granted it was in a major city, but still)
Anyways, my logic was the same, why do a doctor's debt without the doctor's pay? And it's not like I couldn't have gotten into medical school, my grades and experiences were all there. So I withdrew, took a 20k debt and nothing to show for it. I'm applying to medical school now. (But I also have a backup plan-I graduated early, so I'm 22, but I don't want to be out of school for more than a year)
I've never looked back, and I'm much more open to better careers now. Regarding other jobs you listed:
Nurse: My brother applied and got a full ride to a well known school for a BSN. So it's MORE than possible to get a alot of not most of the tuition covered for it. He also applied HSPS and they accepted him for the air force- so he'll be working with them after graduation. Maybe that would be better than working in large public hospitals? Most people complain a lot about nursing but I've actually haven't heard much from people who did it this route.
Dentist: My aunt is a dentist, but she's like 50. She has her own business, and she only works by appt. She's single, but she's probably the wealthiest out of my entire family, with the most leisurely lifestyle? Based on what she's told me. She was also upset I didn't choose this profession as she wanted someone to pass the practice to, and honestly so am I. But I don't think I could dig in people's mouth all day. Plus their debt is ridiculous, and I've seen more dentist shops than gas stations where I'm from.
Hope this helps!