For cooling down: maybe try a cold bath or shower or put some icepacks on your extremities/head in particular

Its odd b/c I have issues with the heat. I sweat like a horse( pigs don't really sweat, exactly) Usually though, after being really too overheated for a long period of time, I get chills. That's how I know I've done too much sun or exercise. You may wanna ask close relatives, if you have any, if that staying hot for hours, happens to them. A genetic component could be involved & that's just the way your DNA deals with overheating. If no one else does, it sounds like something that I would investigate with an internal medicine doctor or if you have a good family doc, who is knowledgeable. I feel for you, not being to cool down. I stay hotter longer than most people, but I believe it's medication related. Once I start sweating, like when I get ready to go out. Shower, drying my hair and changing clothes a couple of times can get me going and I can't stop it, eben when im sitting. It serms to have a timeclock and once it starts it has to complete dome kind of cycle. I get so annoyed b/c sweat is all over my face and no make up would stay on. It sounds silly, but it is miserable getting soaked just to go out for an event. I mention this b/c I don't know if/what meds you're on. My meds have a huge influence making me heat intolerant and causing me to sweat profusely.Im also older, so menopause made me hot, too, but at 66 I should be done with hot flashes, for the most part. I mean, I get literally drenched when I play pickleball. My hair is dripping and every piece of clothing is soaked. So , I feel for you, there. Keep us posted and let us know what you find out.