I can't speak on the issue of MG treatment, but....no offense........it sure sounds to me like you are disabled !

Documentation is key. If your neuro's initial documentation implied that you would be almost good as new after treatment, that could have hurt your case. Documentation really needs to focus on what you can not do.....ie, instead of writing you've had several falls, writing that you need assistance to bathe and need assistance with all ambulation. It'll be hard for SSDI to expect any employer to hire someone to help you walk just so that you can work.