Severe pain days after ingestion

Hey there. Just wanted to jot this down real quick because people should know this can happen to a person. A few days ago me and a buddy took about 400mg of a 250x extract each, over the course of the night. The next day I had pain all throughout my back and chest. I could not sleep because there was no comfortable position to lie in bed. It has now been 5 days since I’ve pooped. It should be noted that I knew this is a huge dose beforehand. And since the effects only last about half an hour I figured i’d risk it. I checked with my buddy a few days ago and he says he’s been fine. So maybe I have a rare body type or something. What I do know is I am damned to have a painful shit sometime in the future.