I would suggest telling your doctor your symptoms. They might be due to the mastocytosis, or they might be from another problem. It sounds like inflammation, which can happen with ISM. The doctor probably will want to do blood tests to rule out other possible causes, such as auto-immune. It's unlikely to be progression of the masto, because you've had it so long. It rarely changes to a more aggressive form. People with cutaneous masto rarely have an aggressive form either.
You're on very little medicine compared to many ISM patients. Most of us take both H1 and H2 antihistamines, such as Allegra as well as Zantac or Pepcid (H2 antihistamines). There are other medicines that can be helpful, such as Singulair and/or anti-inflammatories, such as Aleve or aspirin. Gastrocrom is a medicine that stabilizes mast cells. I would be careful about taking a decongestant (the "D" in Allegra-D). Some people have increased symptoms with that. There are some nasal sprays, such as Nasalcrom, Astelin, and/or Veramyst that can help nasal congestion.
It's also possible that you're getting too much histamine through your diet. Have you seen the low histamine diet? It's very helpful in reducing symptoms, if they're being caused by too much histamine. Here is the link:
http://www.urticaria.thunderworksinc.com/pages/lowhistamine.htmIf you're taking 6000 mg. Vitamin D per day, that's a very, very large dose. It can have side effects at that level, so you might ask about that, too.
Just wondering where you are that you've found a doctor who is knowledgeable about SM? If you don't mind posting the name and city, it might help others.
Let us know how you're doing if you want to post again. We'd like to hear from you.
If you want to post again here after you talk with your doctor, we can give you more suggestions to help yourself feel better if he/she thinks it's masto causing it.