don't have your problem but have pain from a tbi. 600mg gabapentin is really low. I'm just starting to get relief from 1800 mgs. you can go up to 3600 and sometimes more. I don't know where you are located but a really good hospital or clinic is in order. i live in ny and am lucky enough to be near nyu, mount Sinai, etc. but please find the place in your area. good luck