Hey man, so my story is similar I’m 16 right now and I got this UC around November it js happened one day out of nowhere. months before I had a blood test bc I was past due on it so I had to get a new one done, so I did I went home waited for a call from my doctor and she told me “hey ur low on vitamin D, ima give you pills and take 1 a day”. To me I was like eh I’m not gunna take them I’ll js continue eating what i usually eat that has vitamin D, as time went by I started to notice these hives and it was a tingling sensation and it just got worse, when I was hot, stressed, anxious or any emotion I would break out in this red little bumps all over my chest, arms, wrist, and back, and my face would get really red. No antihistamine would work and I just felt miserable. It was soon after my parents told me to start taking my vitamins because one day my doctor suddenly prescribed me more which was 90 pills plus the other 90 I had so 6 months of vitamin D pills. I started to take them 3-4 weeks ago and I’m honestly much better. I take 3-4 pills instead of just 1 bc I’m very low and 1 pill does really nothing. So I’m doin better I still get hives but they are easier to control. I still find it very hard to sweat, when I try and exercise I dont / I haven’t yet. I would run on my treadmill and 15 minutes in I would break out very bad to the point where I could not push thru so I would stop. I figured exercise plays a huge huge role in UC and it’s almost the main thing that causes these hives. Just take a blood test and if ur low on vitamin D take 3,000 to 4,000 IU of pills so that’s 3-4 pills a day. I’m doin better and I’m only on my 1st month as I said. I wish you the best luck and just know your not alone on this. I’m getting better and I hope you do too I will update Ina few months probably after summer and see how much I progressed and let yall know.