That is a good idea ask for antibiotics ahead of the test. Some are prescribed for stomach ulcers. Also you can take up to 2400mg of Tylenol a day so take 500mg a time. I don't understand why he didn't prescribe a suppository or something after seeing inside your j-pouch. I would call daily and ask this plus tell them the Tylenol isn't working and ask for tramadol at least. The squeaky wheel gets oiled so keep calling and ask to speak directly to the Dr. I have heard of others that go to the office and stay in the waiting room to catch the doctor. I think that would be too uncomfortable......but you get the idea.
Please get a pcp and explain that your GI doesn't prescribe pain meds. You are only asking for enough to get your pain reduced until the tests. You need to get established with a new pcp anyway. My gi's never prescribed anything other docyclomine (spelling?). You are in agony