Hi Robin,

  I hope you found the answer to your questions, as it appears no one replied to this post.  There is a lot of information on this forum about testing.  Starflower has posted a sort of flow chart of tests to rule in or out mast cell diseases.

  PPIs are a different type of medicine than H2 histamine blockers such as Pepcid and Zantac.  Those two attach to the H2 histamine receptors, thus blocking histamine from attaching.  They don't affect stomach emptying, but they also limit stomach acid by blocking histamine.

  If you don't mind posting it, where do you live?  It sounds as though you should definitely see a mast cell specialist.  99.9 percent of doctors won't know what to do with someone who has your symptoms, but a MC specialist will know how to rule in or out a MC disorder.