I can not go into a sauna without becoming bedridden, vomiting up my socks and being out of it for three days. Steam baths also do this to me. I can go in a hot tub or a hot bath. Wind triggers them, like standing at the bow of a cruise ship which I will never do again, and sun and wind together also do me in. I am triggered by chocolate of a certain quality and sometimes the sulfites in wines. Barometric pressure changes also do me in.
   If I try to avoid my triggers, I can keep them at bay for the most part.