Sorry, I can't remember if you have a diagnosis already or not, but most mast cell disorder people do react from heat and sun.  (I always had the most awful time going to my daughter's softball games in the summer in the south!  100 degrees, 98% humidity, no shade.  Flushing, headaches, feeling sick.)  You can tell if it's a mast cell issue if you pre-medicate the next time you have to be outside in the heat and see if extra meds keep it from happening.  Hydration is so important.  Those mast cells get really cranky when they're dehydrated and it's hot out!

Hi All ,

I have a limited window between ok and overheated - needing meds and cooling asap . I surprised a friend last week who has not seen me in the summer until now . I viewed my new property and the heat of the day ( spring here - 21 0c)  and no fan , meant I lasted 15 mins outside the air conditioned car before I was bright red and itchy . I pre medicated to achieve this time . And rested for the rest of the day

Direct sunlight and indirect heat from - are known as mast cell triggers . I can't sit in the sun at all now . Shade all the way . Don't get me wrong , I used to be a sun worshiper ( with sun cream ) . My boyfriend notices how much happier I am when kept cooled . I am happiest when my skin is cool to touch . Serious cold ( 0 degrees or less ) will lead to me triggering . But heat is far quicker ;-(

Cool baths remove some heat for me . I do wander if I could produce energy and sell it to the electric grid ???

Adaption again , has been a vital thing for me

ttfn ( ta ta for now )

Jose