I have that diagnosis, but it's just the RSD spread in my head and face, eyes too. I use nasal ketamine and 4% lidocaine nasal spray and after a couple months it started controlling it very good. I have tried stellates and speneopaletine (sp?) blocks and cervical faucet blocks. The cervical block helped for a little while which tells me that is what is mediating my pain in my head. It is SIP. I am thinking of doing laser surgery to clean up my spurring and stenosis in my neck to see if it would help knock the burning down. My back, face and head are continuously burning since my foot surgery in 2011.