How do you stay motivated?

I'm 34 weeks pregnant, but Im hardly ever motivated to do anything. I don't feel like cleaning, I don't feel like cooking, I don't feel like showering, and when I do shower I don't feel like washing my hair or shaving. I don't want to brush my hair, it's too much. My hair basically stays in a bun that resembles a rats nest. On top of it, I feel angry 97% of time. I feel like its hurting my marriage and I don't know what to do.

I talked to my mom about it and I told her that I think I needed to talk to me doctor, but she told me its all in my head.