Feeling worthless & stupid

My boyfriend constantly yells at me and tells me I'm the problem in our relationship. He says a lot of negaitive crap about how I"m not fixing my mental disability when I try every day to work on it with therapy & meds. He screams @ me and it makes it even more frightening to feel like I can be happy & progress in working on my disorder. I want to feel like the happy girl I was when I wasn't with him, yet be with him because I love him & we have a baby on the way (I"m pregnant). So, I'm looking to find happiness in the storm.