Lot's of painful gas
I've had this issue for the past 6-7 months where I get an enormous amount of gas that sometimes doesn't even come out, I'm 16 years old so when it happens I'm usually at school, I figured it was school food so I started bringing in food from home but It was the same thing, also I've had a retarded amount of pimple cyst like things on my thighs that I've had for about the same time, I usually pop them because the of the amount of pain they cause and puss comes out, please excuse my sort of blabbing but I've had 2 other issues where I have a lot of redness on my forehead which i think is dermatitis and these almost scab like things on my stomach/arms, lastly I just haven't been feeling the same, I'm really tired all of the sudden and temperature-swings where I'm randomly really cold or really hot, like I said all of this started happening 6 months to a year ago. Any feedback on any of these subjects is greatly appreciated.
P.S. I forgot to add that I've been getting a ton of diarrhea, more diarrhea than normal stool.