wish I'd seen this when you posted it...I had the same thing happen...pain was so bad I went to the ER...here is what was wrong...gas!...apparently when they placed the tube, I was pumped full of air, or something like that...I was never real clear on that...they didn't make sure I was "deflated" before i woke up...so, it was a major gas attack...not the "pew" stuff, just air...hope this helps anyone else that has this happen to them