It sounds like you could use that therapy. And some friends. I came here because I was beginning a period where my introspection level went way up, my first year of grad school. Believe me, I know how that feels. I've lost a whole lot of sleep over my transition, which is tough when you're losing a night or two minimum to electrodymanics problem sets already.
Therapy helped me a lot, and my friends even more so. I can't say I was really ready for transition, but I also couldn't abide not transitioning. That's a pretty good recipe for disaster, which is pretty much what I got. My life kind of imploded for a while. But I'm pulling the pieces back together. It took me a hell of a long time to get into therapy myself. I had some when I was 22, but that was because my life was a complete disaster then; and I was seriously considering transitioning when I was 25, but I didn't think I could handle it because my social support system was still rather shaky. Things got better, and that's when I had to transition, pretty much the second I had what seemed like the bare minimum of support. I'm not the type that can just go it alone.
I guess what I'm really saying is that what you're going through sounds familiar to me, and you can get through it.