One of your problems is that you are in Canada and a victim of OHIP. No wonder your dr. told you no new scans. You'd probably have to wait a half a year for one anyways. In anycase if you have a possibility of getting to Buffalo and have any way of getting insurance in the US or paying outright just for diagnostics you'd be way better off.
I'm so sorry, it's bad enough to have to deal with the actual illness, and then there's the insurance and all the red tape.
Good luck to you.