Sex after baby

Has anyone experienced lack of sexual interest after baby? Please help.

I had a baby almost three months ago. I’ve been exclusively breastfeeding and I’m going nut!!!!

1. My husband bared helps at night but he doesn’t want me to try formula in case it might help baby sleep longer

2. He doesn’t want to take me anywhere nor care for me anymore. I used to but it’s as if I disgust him. At this point, I know he is seeing someone cause he is very intimidate

3. Did you feel bad when you switched from breastfeeding to formula feeding?