Why am I so irritable all of a sudden?

I usually am a nice person. I don't flip out usually, but lately I've been so angry at everyone and everything. I've been to a doctor and he told me to try therapy. I've been to a few programs and several therapists and been on numerous medications (that don't help at all btw). I had to stop therapy because I turned 18, but I still talk about my feelings with my boyfriend so I'm not bottling anything in. And its not that my period is coming because its a lot worse then. Before I would just get really agitated and suicidal before and during my period. Now I'm like this all the time. I know I caused a chemical imbalance from not getting the proper nutrition. (I used to be a vegetarian). But I'm eating meat again because I realized being a vegetarian was killing me, but it seems like it's getting worse. I don't know what to do now. Oh yeah, and I would go back to therapy, but my mom doesn't think I need it. She wants me to deal with it on my own. (And on top that I'm a rape victim and she doesn't want me to talk about it. She's afraid of DCF.)