I was researching a masto-related subject and came upon an article by a doctor in the U.K.  who seems to know quite a bit about diagnosing mast cell disorders.  Here is the link:  

[url]http://www.allergy-clinic.co.uk//url]

His name is Dr. Adrian Morris.  Thought I'd post this, even though I don't know anything about him, because he seems to understand MC disorders and the illnesses to rule out before diagnosing one.