I think what lejla is describing sounRAB like dermatographism. Look it up to see if that fits your case. I agree too that you should go to a different doctor if that is his/her attitude.
I've had chronic hives off and on (mostly on!) for the last 5 years. Started off with prednisone which can work, but are not good on the system and has a rebound effect after you are done with it. Tried hydroxyzine, etc. which helped me sleep but didn't make the hives go away. Tested negative for all allergy testing, but showed Vitamin D deficient 9 and 3 months ago. 9 months ago also showed low T4 but that came back up to normal range. Allergist has me on singulair, tagamet & zyrtec -- says I will need to be on for 3 months prior to moving me up to the next level - doxepin - if these don't work. And that if it works, I have to be on the drugs for 9 months before being declared "hive free". Well, lo and behold, the hives have 98% gone away (which means that sometimes they are gone completely and occasionally I will notice some on my hanRAB, but nothing compared to the full-bodied monstrosity I used to be). About a month or so into this drug corabo, I started to experience serious reflux and GERD which never has happened to me before so I guess my question is whether anyone else ever was on this corabo and had negative/positive experiences. No discernable cause has been discovered for my reflux and I really wonder about the side effects of my particular drug cocktail being a cause.