Kim, I have been on Remicade for almost 2 years. I had to stop because I moved from Germany to America and I had no health insurance at that time so I missed my next infusions
Anyway, during that time I had some diarrhea as well but I can tell you I was not in a flare. Sometimes I just ate something which didn't agree with my stomach. It went back to formed stool after. Did you eat something which wasn't that good for you?
I actually started flaring once or twice when I was on Remicade every 8 weeks. But I had different symptoms. I would get urgencies with mucus which is always the first sign of a beginning of a flare for me. Does that happen to you? I switched to every 6 weeks and it didn't happen anymore.
Can you have your doctor take a blood sample and see if the CRP raised? That would show if there is an inflammation in your body going on. Just to make sure.
I would suggest stay calm. Diarrhea on Remicade can happen but this doesn't mean a flare.
All the best for you.