When I was flaring badly I passed out a couple times. Turned out that I was severely anemic. Had to get a blood transfusion and several iron transfusions.
I agree with the others .. you need to get stool tests. Blood counts would be a good idea too .. a CBC and a complete metabolic panel that includes checking potassium levels.
If remi is losing effectiveness early, the dosage and the interval can be increased. I am now at 10 mg every 6 weeks. I will know in a couple weeks if this is where I need to be. My next infusion is 3/7 and if things remain as good as they are now I am declaring remission