Here, Beestie, I'll even out that ratio a little...
Stacey, I went through a period where I was overreacting to stress like you are, and the larger reason was I was very depressed at the time. Had you asked me then, I also would have said my relationship was going well and everything was fine, but depression isn't always so directly obvious. Maybe talk to a counselor--and get on birth control pills to regulate your periods. They make everything light, easy, and very predictable.