My primary doctor referred me to a neurologist. He says the problem is nerver related with no known cause. Quite a concidence (IMO) that a neurologist would assume its nerve related, even though he has no idea of the cause. I find that very frustrating because he has no interest in finding the cause beyond assuming a damaged nerve.
In my case, the pain trigger is certain types of foods. i.e foods with chile pepper (like most Mexican dishes), or black pepper, or any food that is acidic like tomato based sauces, or chocolate, or cinnamon, etc. etc. So could it be some rare type of allergy that I developed? I am asking my Primary that tomorrow morning. It just feels like all my doctors have zero interest in pursuing a cause.
To answer your question a bit more specifically, I do get some pain relief from progabalin (aka Lyrica) as long as I avoid all the "trigger" foods.