i have the SAME kind of thing, just like raging anger and find myself shouting at my husband before i even know it's happening. it has happened after the first baby, and during the pregnancies of each subsequent one. granted, my husband has his own problems, but i've known that and been dealing with it in more helpful ways than screaming....sometimes things come out of my mouth that i don't even agree with!
you can explain this is your hormones talking to your boyfriend----he MIGHT have a bit more sympathy. and i agree, call your doctor TODAY, see what can be done to help you out. i have already ordered the over the counter stuff that i have always used----but your doctor should be able to help you find something that will work for you.