Bad temper

This 3rd pregnancy has definitely been my hardest. I’m 36 wks now baby will be here soon but I’ve felt like this from the beginning. Ppl say it’s because she’s a girl. I dk. I feel like such a grouch, my brain feels foggy, I have zero patience, I’m short with those I love. I’m tired, I’m wrestles. I can’t sleep but that’s all I want to do and lay in bed all day. My energy is low. Please someone tell me once she’s here I’ll feel better or what should I do. I don’t feel like myself. I had post partum with my first it lasted 3 mos I managed to change my how I was feeling without pills. I really don’t want to be prescribed anything but know if I continue this way I might have to.