need some advice

My sex life with my husband has become quite shit. It used to be ok but I've never ever orgasmed with him (or anyone else) I only have if I use my vibrator on myself. Idk what to do. I work as a CNA which has fucked up my body in so many ways so me bending this way and that really hurts and makes it hard for me to enjoy sex. Also he is very overweight so him laying on top of me makes it extremely hard for me to breathe.