I want to add a list of medications commonly prescribed, as I see that a lot of people find the site on just such a search. Of course, only your doctor can know what will be best for you, and it will be with this caution that I'll list H1 blockers, H2 blockers, etc. I advise all to look to the very bottom of this blog for the info sheet from The Mastocytosis Society.
The Mastocytosis Society has accepted me as a member under their Angel program, for which I am very grateful. They seem to be a great group of people and I encourage everyone visiting this blog to go there first in their search for info.