I'm a raging bitch

I'm 22 weeks with twins, very much wanted after 4 years of infertility. I hate it most of the time I'm just so angry and unhappy. already on meds for depression and anxiety that I've been treated for for many years. everybody and everything pisses me off. I'm so fucking uncomfortable with my body right now, not just physically. I feel like a terrible person. I can't sleep most nights from insomnia and intense restless leg syndrome. my mom is so annoying all the time and thinks she knows everything while being equally fucking annoying to the point that I resent her. She keeps calling them "her babies" and she thinks it so funny. She drives me mad. my fiance thinks I should be able to "control" my emotions. he is only so supportive before he just can't do it and he is a dick back to me. he proposed to me 2 weeks ago (we've been together 10 years) and he didn't even get the fucking ring size right and it's too big and I don't like the band at all, as it's uncomfortable. please someone tell I'm not going crazy.