Welcome to Neuro Talk. I sure would hate to have you spend all that to get to Mayo clinic, and then not be satisfied with a DX. Yes they are very good at DX. I went there in the early 80's for auto immune problems. A little impersonal, but good none the less. I think your expences would depend on what testing they would want to do for you. A referral is also needed from a physician. If you go, bring all of your records. There is housing available for those seeking treatment. You stay in a home with your own bedroom and bathroom for very little cost. This can be found on Google or their patient advocasy program. I did this, and it saved alot of money for the week I was there. If you can find out through NT, what the tests are for RSD and CRPS, maybe their staff could give you an idea of the costs before hand. I sure hope you can find dianosis and treatment. Ketamine infusions have been used by our service members and others with success. On the RSD Forum, you can read about it. I do wish you all the best. I am sorry you are in such pain. ginnie