Yoga and Catharsis (Emotional Fitness?)

I'm just looking for feedback from those who have experienced an intensely uncontrollable outpouring of emotion from their yoga practice.

I've had a bad few years. I've dealt with abuse, homelessness, the loss of a parent, estrangement from friends on top of all the medical issues that have always been a part of being me. I've done yoga on and off over the years, and I even have a mat tucked away in the corner of my room.

It seems like an obvious match, but I've gotten to the point where I'm afraid of everything. I hate leaving the house, and I only enjoy the company of my partner. I cry at the drop of a hat (hey, no hat deserves that kind of treatment). Social injustice, I cry. Teegan and Sara ft. The Lonely Island singing "Everything is Awesome" at the Oscars, I cry. I cried at the opthamologist last week because I couldn't sit still for the pressure test. I'm a pro at uncomfortable medical tests.

This life isn't working. I have difficulty taking medications for my bipolar because I have a kidney transplant. Therapy has been happening for over a year, and it's not stopping for probably the rest of my life. Doctors are my full time job, and I'm sharing every change I make with them.

Um...I've also been having trouble focusing, and forgot exactly why I started writing all this. I guess it's to..oh, yeah...feedback. How did you find the strength to let go of your past? I fear that I'm just going to get there and be so overwhelmed like I always am that the tears just won't stop. Does it get to the point where an instructor will be like "Maybe you just need some ECT."

I'm looking at Yin and Restorative classes to start. I don't want to ruin anyone else's practice, and I really can't afford private practice, but home practice isn't an option, either. I'm checking for free community classes for troubled women, as well (never thought I'd be one of those...), but the worry is still the same. And I'm always going to be worried about it unless I do it.

And advice from people who have been (or still are) yoga cryers? If I stop in for a first visit and melt, will the instructor let me know if it's an appropriate studio/class for me, or will I have to ask on my own. I know it sounds childish and a normal adult shouldn't be experiencing these things, but I'm trying to solve them.