Wow. Dropped out of med school? Thats pretty heavy. If you've been flying for 820 hours it sounds like you really do like it. Was med school that bad? How hard would it be for you to go back if aviation didn't work out? Also, what is your undergrad degree in?

Aside from that if you have the mental capacity to handle med school you'll have not the slightest trouble learning IFR, commercial, CFI, etc. And with 800 hours you'll be close to being able to apply for any regional...just need to get your 100 multi engine and some hours of dual given.

Just be prepared for the possibility that it might not work out. Do you have any friends/relatives working for major airlines? Those are basically required to get a job with them. In any case look for a good regional like SkyWest and Air Wisconsin. Avoid Mesa and GoJets at all costs. You'll find out why soon enough.

I'm still on the fence about airline flying. I'm working on a degree in meteorology right now. If I did become an airline pilot and it did not work out, my plan would be to go back for the MS, or coincidentally, go to grad school to be a physicians assistant.