lower right side adbominal pain after c section?

im 24 and i have a 2 yr old child. ever month around the time of my period i have crazy lowers right side pain in my stomach . the pains are so hurtful to the point where i can even walk , it hurts to stand up, i cant caught my breath if i move to fast and etc. this pain also goes on 5-7 days after my period gos off. ive visted host. but the doctor sees nothing.. but theres a small lil bump inside of my stomach that you can clearly feel if touched.. plz help me or give me advice. i need some answers this is really messing up my life -(