Ulcerative colitis flare-up or additional infection?

Hello

Since the beginning of April, I have been suffering from an ulcerative colitis attack with diarrhea, rapid heartbeat, and recurring fever and fatigue.

Blood work was OK before the flare-up in March. In April, CRP was at 60. During follow-up, thrombocytes and leukocytes were also elevated at 35. I then stopped taking my medication (mesalazine, Salofalk) because I thought that might be the reason for the high temperature, and because it was improving. After that, however, it got worse again, and last Friday my blood work was also worse (CRP at 90). So I've been taking the medication again since Saturday. CRP is now at 69, and leukocytes and thrombocytes are now normal. HGB is slightly low. Since last Friday, however, I've also had pain when swallowing. But that doesn't add up for me. I've had elevated temperature and palpitations on and off for 2.5 weeks, and only now have the sore throat. That would be strange and might have no connection at all. My spleen is 2 cm larger, but the doctor said that's normal for inflammation. Now I'm not quite sure what that means. Could it really be caused by the colitis? If it is an infection, how can it last so long and especially the initially high temperature and then only two weeks later the sore throat?

I'm just afraid of cancer or something. The fact that the CRP fluctuates, or rather, drops quite low, then rises again, and then falls again (possibly due to the medication I stopped taking), means that the inflammatory activity is fluctuating, and that has nothing to do with cancer, right?