Hormonally Overwhelmed

I am really struggling emotionally in my 3rd trimester. I have around 5-6 bouts of serious depression and tearfulness everyday. The whole thing is exacerbated by the fact that I am stressed I am not giving my husband enough (read: any) sex and I am so scared it's going to make him resent me because he doesn't really ask for it anymore. That also makes me worry about the fact that I am probably so unattractive anyway that he doesn't actually want it'll begin with and that he might look for it elsewhere. Does anyone else feel like this? I'm overwhelmed and tired and just wish I could get that happy pregnant feeling back.