Laura -
I had issues with post partum flares with both of my girls. Not with my boy. I don't know if that's just a coincidence or what, but both times I flared about 4-6 months afterwards. I find that breastfeeding helps slow the decline in levels of all of those good hormones and it keeps the flare at bay for longer. I don't know if that can be proven, but at least that's how I connected the dots. The best thing you can do is just be aware that it *might* happen and be ready with a plan of attack. With #1 I flared so severely that I had to wean her within a matter of weeks and it was traumatic - probaby mostly for me, but it wasn't easy for her either. So, with my 2nd & 3rd I introduced formula early. Even if it was just one bottle a week. I was never able to pump enough milk to keep a stash in the freezer. So, I figured if I got sick and had to wean to save my body, the baby wouldn't be upset with the switch to formula because it would already be a familiar taste. Never had to wean 2 & 3 early, but when I did wean, it made the transition to formula smooth! Anyway, I thought I'd throw that out there for whatever it's worth.
I've taken 6mp a few times. We have a love/hate relationship. Sometimes it helps me, sometimes it doesn't. I have taken it before with remicade - once with success and once with no success. Since you are doing well now, there is no reason to start it while pregnant. But it's good to keep that in your back pocket in case you flare after baby comes.
I don't know why your GI is so against nursing. I would consult your OB on that one. When I was pg with #1 I wasn't very educated on the subject and when I told my OB I wasn't going to breastfeed she looked at me horrified and said, "WHY NOT????" She told me I could with all of my meds and explained it all to me. GI wasn't up on that info, but my OB was.
I was told that I have Crohn's colitis because I have all the markings of Crohn's, but in my Large intestine/colon/rectum and NOT in the small intestine (which is more common I guess?). I don't know what the symptoms of UC are, but I assume they are very similar to Crohn's. I have been extremely fortunate to avoid surgery. I was at the point of surgery about 8 years ago, but I went on the Specific Carbohydrate Diet and it saved my guts. If I ever get desperate again, I'll go on the diet before I let them cut me. I'm terrified of surgery and would only do it as a last resort. Anyway...
If you have any more questions or whatever, please feel free to ask!