it feels like my rectum is on fire. could it be acid from my stomac? kind of like a reverce heartburn? it doesnt happen every time i go to the bathroom but more then 1/2. i am assuming its my diet because i really dont eat right but could this be something more. it has been happening since i had my second kid. we have been having anal sex about 2 times a month since then. (cant have sex for 6 weeks after a vaginal delivery so we tryed a different hole and enjoyed it so continued) my kid is 7 months old. it hurts so bad sometimes that i cant move for a few min.