I don't think it ever hurts to get the opinion of a mast cell specialist.  Mast cells affect nerves, and malfunctioning mast cells can affect the function of nerves.

I haven't taken gabapentin, but I've heard some good results in the few people I've known who took it.

First of all, I've had some good results from physical therapy.  Some have been too rough on my sensitive body, and I've had rebound pain. Others have been great, teaching me about body mechanics so I can avoid causing more inflammation in my body and helping me get re-conditioned after a big flare.  

Being a better patient, to me, is getting all the information from as many doctors as it takes for you to feel like you're doing everything you can to have a good life and feel the best you can.  Dr. Lichtenberger may be all you need, but if you think you still want to see a hematologist for further answers and/or testing, by all means see one!  You can go see Dr. Afrin in Minnesota if you are able.  He's scheduling a year or more out, but there is a cancellation wait list you can get on to possibly see him sooner.  I don't know who, but there must be a good hematologist for mast cell disease in Boston, too.