Well, I’ve learned that not only is dermatographia (mine isn’t raised, either) is not only a histamine reaction, it can be a sign of mast cell disease.
Since I posted the question, I’ve jumped on the mast cell bus and my kids and I are taking double dose Zyrtec and Zantac (ask your doc!) until we can see the mast cell specialist. WOW, is it helping!! Meanwhile, I learn that mast cell dz and EDS/POTS are often related. Holy cow!
I think I know why, and am writing Part 2 of my theory. Did you see Part 1? I’ll have a page for it, but meanwhile it’s the first reference under the video called “Why EDS/POTS patients are so ill”. Please take a look! The references for the paper are all listed with links to the articles. 🙂 Any you may want to peek at my 2 videos about my symptoms and see if some of it sounds like you. Feel free to holler back if you have any questions, OK?