Switching to Xeljance

I am way more nervous than I have been starting other medications. I go next Thursday to get premliminary blood work done and to pick up samples so I can get started while we wait for insurance approval. I have talked about parts of this before, but background is that for the last 4 infusions I have gotten a sore throat 2 to 3 hours afterwards for the rest of the day. The last infusion the sore throat went away with a coughing fit. I felt way worse than usual the day after, and about a week later, started terrible muscle aches, fatigue, and general pain that only lifts a bit here and there. My GI was concerned because my esophonils doubled from last time. After I told him what I have been experiencing, he agreed wholeheartedly that my Entyvio antibodies seem to be catching up with me. Colitis wise, I am flaring. Pain and bleeding is easing a bit in response to me uping Qing Dai, but still going 6 ish times, urgency, tenesmus, bleeding. I expected to be flaring terribly before going off Entyvio, so it feels like I am just running through the meds even though I know staying inflamed all the time is not good. Anyways, I see some pretty positive stories on here regarding xeljance. Anyone know how long it might be before my body calms down from the Entyvio?

here, in this forum are lot of info about xeljanz... i take xeljanz but this it not the best for me.
the results are tottally individually.

My pain has not been as severe the last few days. Tuesday is four weeks out from my infusion. I will likely get to start the Xeljance on Friday. Today I had one of my severe fatigue days where it feels hard to lift my arm off the couch. I have those usually only when tapering prednisone. I am not doing that currently, but it may just be because I my body is extra stressed.