How do I stop myself from feeling hot and sweating under stress?

Im in a band and we have practices every once in a while. For some reason, last year I played a wrong note and my face went all red. Since then, there is this issue I have about worrying that I am blushing. It got worse and now I sweat and blush really bad. People sometimes ask my if im okay and I say yes. Its not the fact that I made a mistake that is causing this, its the fact that I cant help my blushing and sweating. I usually arrive at practice, think about the fact that I’ll blush, and as soon as I play a note, my face goes red and I start to get really hot.
ps. Ive tried the not thinking about it, It doesnt work. Ive gone into practice a basket-case however, and Ive come out without blushing once. Im confused and I just never want to blush again.