Wow that's interesting, Mrs. d! I don't get any swelling or even wheals, just bright red lines when scratched...and also an exaggerated flushing response at times...possibly developing some kind of rosacea. These things are definitely worse during these times of the month that I speak of.

Heat is my worst issue. Just now cooking, our kitchen got really hot, and my whole head flushed terribly, I have some sort of weird scalp headaches. NONE of this is internal...by blood pressure and internal temp are never affected, I have monitored both. It all seems t be superficial. Still uncomfortable, though!

I am going to read those links.