SUNSCREEN in UV

I get a weird overheating and migraine headaches since I had heat stroke.  Since I do a lot of work outside and own a convertible and a wrangler I wear sunscreen much of the summer.  I found the mineral blocking type sunscreens give me a longer window before I begin to feel sick and overheated. I have tried this multiple times. I first thought it was the oils and lotions but even the sheer and oil free ones did it to me.