H.P.
Hi,
I am sorry I didnt get back to you yesterday, but I went through the exact same thing a few months ago. I had a root canal done, and withing 48hrs, was in more pain than I thought was normal. I had to go out of town for a family reunion, so my dentist called me in an antibiotic and pain meds. When I got back I went in to the doc and it was still infected, and he had "missed a canal". He had to re-do the root canal, but after the second one, and second round of antibiotics, it is fixed. I ALMOST just had it pulled, but I am glad now that I didnt, because it is a fairly visable tooth. I do have pretty severe dental anxiety now though. My dentist said it should get better in time as long as I dont have to have any more major work.
Good Luck!!