Does anyone else get intense bowel issues (cramps, diarrhea, etc) after being in the sun or working out and getting very warm?

I’m not even talking about hot hot weather but even like 15C/59F if I’m outside for more than 15 min once I get home I get super ill

I know I can’t regulate my heat well and I feel it has something to do with this since it also happens if I do a workout and get really warm (not even very intense workout)

Has anyone had this and figured out what it is or a solution? Doctors are stumped and I feel like a crazy person

Sometimes it lasts the whole day and sometimes it’s only an hour

I make sure to keep up with my electrolytes