I think I might be sick?

It could be the heat. I know 80 doesn't seem that bad but when you sleep it's probably getting 90+ in the bed. Same with football not sure if your using gear or not but with gear it's probally 95+ maybe 100+ in the pads and helmet. Also the weight room, with it hot outside and a bunch of sweaty guys surrounding you it might be hot. Vomiting and diarrhea is a way your body releases heat when it's hot. But always see a doctor if something's wrong you could even talk to coach about it. Good luck