I hope someone can help me or at least understand?

I met my bf last June when I was about one month into taking 60mg Prozac daily. I had been on and off Prozac for years before this. when we first met our sex life was great, but for the past six months my libido has been absolutely non existent. I spoke to my psychiatrist about this and he put it down to the Prozac and changed me to Bupoprion, I really hoped this would fix the libido problems but it hasn't. it's been about 2 months since I changed medication and I don't know what to do anymore. for most of our relationship we have been long distance so the lack of sex wasn't so much of an issue, but now we are living closer together. My therapist told me to try a few things, like reading erotic fiction but it just doesn't work. I don't think it's my boyfriend because I'm very attracted to him and it's like my sexual appetite has gone completely even when I'm alone. 

I think about it 24/7 and am constantly beating myself up about it and feeling guilty, I will feel like I'm making baby steps but then my boyfriend will try to start something and I just shut down and feel anxious and disgusting. the thought of sex almost makes me feel sick. he's been so patient but I'm starting to think running away and letting him find someone normal to make him happy would be the right thing to do. I feel like I'm broken.

I hope this isn't tmi, I've lost my therapist since moving and I'm desperate for any suggestions or advice or support.