I was just reading your post and I normally don’t comment on any of these, but felt compelled to do so as you seem to have two of the symptoms I have been suffering with for many years now. I am not vaccinated so I’m not really sure what caused my hives to appear (maybe a vaccine received in my earlier years), but I started noticing my skin changing when I was about 14 years old. I wasn’t diagnosed with dermatographia until I was about 25 (I’m 34 now). Unfortunately I don’t have any tips for you as my doctor didn’t really suggest anything other than an over the counter Benadryl if needed…basically was told just learn to live with it! I was more intrigued when you said you had esophagus problems. Ive also had ongoing difficulties swallowing…somewhat painful at times, but it is ongoing on a daily basis. I went to see a specialist, and was told that it’s related to anxiety. I then went to get a second opinion because I found it really bothersome…..and was told it may just be mild acid reflux. I do also get a warm sensation when I break out in hives. I did speak with someone I know that also suffers from this condition, and she advised me that when she removed sugar from her diet the hives stopped….I haven’t tried it (I like my sugar lol) but she seemed to have success. I don’t know of any support groups, but I was really glad to find your post!