Where is this rage coming from?

I have never been exceedingly good natured, but I have never lost my patience as quickly as I have been lately. One single thing bothers me, and rage flares up. I can feel it all over my body, and I snap, screaming and often cursing, especially at my boyfriend who I love so much. I have an anxiety disorder and I suffer from depression. I'm not a happy person, I do have a lot of anger and sadness... but it is unlike me to be rageful like this all the time. I never feel relaxed. My doctor doubled my dose of Welbutrin to 150mg, could that be causing it? Also I take a low dose birth control pill, Kariva, which I have stopped taking for good very recently because I'm afraid its causing the personality changes. I'm going to cut my Welbutrin pills in half from now on and wean myself off of them. I desperately want to have my old personality back. What is going on here?