diarrhea

My baby was born 9 days ago via c section and all of the sudden I have horrendous diarrhea. Like extremely painful and explosive. Today I was feeding her and had to give her to my husband and run to the bathroom because I had to go so bad and was in so much pain. I also just finished my oxycodone pills that I was taking for pain so I'm not sure if that has something to do with it... anyone else in the same boat?