I had a baby by c-section 7 months ago. & i feel nauseous on and off every day. could this be my body still healing or my birth control pill ?

Nausea: First off, if you're not having regular periods, get a pregnancy test and make sure you're not pregnant. Regarding what's causing the nausea? It's probably neither. Most unlikely the c-section. Pill possibly but not if you've taken it for a while. Maybe something to do with your diet. Are you constipated? If worried about your pill, try a long acting iud or arm implant or a vaginal ring.