Anyone with a cat & extremely bad allergies? Does this affect your Crohns? I'm not feeling well at the moment.

My sister adopted a new kitten (male, orange, not neutered yet) and i'm having really bad allergies to him. I already have a female black cat that I had allergies to, but i'm adjusted to her for some reason. She's out for study abroad in a different country right now and i've been taking care of the kitten, but I feel like my immune system is going into overdrive.
I wake up with night sweats and just generally feel unwell since my sister has left this kitten into my care. Can't tell if I should be worried about Lymphoma (on Humira) or whether it's just allergies. I sneeze uncontrollably and also get itchy hives after staying in his room.
Has this happened to anyone? She won't be back until the beginning of August and i'm a bit worried. Can't tell if I should be getting the night sweats checked (it's only been about 3 nights since she's left and all 3 nights i'm sweating).