My daughter has dermatographia but I don’t. She was tested for EDS but the geneticist says she does not have it. She does have POTS, gets abnormally tired and has other symptoms that make me wonder. My Grandmother was known for her dermatographia! As for the antihistamines I take Zyrtec,Zantac and sometimes take Quercetin. The Zyrtec and Zantac actually took my chronic back pain away! I have a Harrington Rod from scoliosis and had been in pain for decades. I owe you a big THANK YOU for that one. 🙂