so if I get your story right:
2013: you were put on both 6-mp and remicade after a colonoscopy revealing starting problem in ileocecal valve., but no fistula. At this point, this type of treatment is given to moderate-severe cases of IBD usually. so unless your past GI saw something else that we dont know in the reports, yes it seems like a pretty strong treatment for your initial case as your GI says.
2015, colonoscopy and despite use of both Remicade and 6-mp, a Fistula has formed and ileocecal valve and small intestine still and now both show some disarray. Seems like your situation deteriotated and this dosing of both treatments were not enough for you or that they unfortunately just do not work for you... (I hope im understanding the situation properly, correct me if im wrong.)
so your doctor increased your 6-mp from 50 to 75mg/day (Am I correct?)? hoping that a higher dose of 6-mp would take care of the situation? he bets on a higher dose of 6-mp to bring remission. Its not a bad thought imo. I was once on 50mg of 6-mp and this was not enough, not therapeutic dose for me. Despite a initial positive response, I relapsed 3-4 months later. My GI then increased my dose to 75mg and then bingo, long lasting remission for several years. (never had a fistula though, only inflammation)
. So maybe that what your doc has in mind too.
Your Remicade dose maybe could have been increased too, depending on what schedule your were on. But it seems like your GI has more faith in 6-mp to get this situation under control according to his experience. is that the conclusion of the GI group meeting too?
You mention your GI discussed your case with other GIs, which is great and very responsible move on his part. If you still feel unsure about this decision, as other said, you can go for a second opinion, but in another hospital and find a GI who specializes in IBD. Do you know if in your clinic and in the colleague discussion, there was a GI who specializes in IBD? Maybe your GI talked with one in his group discussion. Thats what doctors do with difficult IBD case: they ask the IBD GI expert of the GI team, if there is one.
we often come to crucial decision with IBD unfortunately. not easy indeed. I have a tendency to fallow your GI opinion mostly because he discussed your case with other GIs. He doesnt seem like a authoritarian, unilateral doctor, which is good thing too. he is open to discussion and other opinions and even expose them to you. The decision he took seems like it was a result of a group discussion, I find it reassuring.