Last exam (Uni) in a few hours - crazy heartbeat, flu symptoms, red hot face, can't sleep

Hey guys, So tomorrow morning I'm going to write my (hopefully) last exam at uni. I only had five days to prepare and will probably get ripped a new one by totally failing this exam..

I should be sleeping by now - obviously I'm not. I'm laying in bed for two hours now, my heart has been beating like crazy for even longer. My throat hurts, my nose feels half stuffed half runny. My face is quite red, feels hot and somehow sore. Also my hands: red an sore, skin had teared open by itself because of the dryness, a few cuts started bleeding. It feels very inflammated. Overall I feel somehow dizzy and a bit out of body. I'm very weak (not that tired, more like fatigue?). The symptoms now are beeing, accompanied by me having super short breath. Laying is rough. But don't I dare to do some physical movement - my heart will completely freak out, I won't be able to breathe properly.

And I don't ducking know what's going on! Could that be Histamine-related? I take Dao-enzymes 3x a day, sometimes antihistamines as well. Sometimes it helps. But the last few days have been horrible and I don't really now why.

I do have high stress for the last several months, that's right. But I thought it's already a bit less stressful by now. So I wonder why I feel worse.

Thanks and appreciation for any answer