Sounds like your GP is a little more helpful than the others. Can you ask him/her to prescribe prednisone for you. It is a commonly prescribed drug for many different things from poison ivy to lingering coughs etc. I'm surprised they are giving you such a hard time with this, it's a very inexpensive drug.

2 years to get into a pain management clinic?? That is ridiculous. Do you have other options, so you could possibly get a different neurologist?