Do you have specific genetic testing results (deletions, corss-hatchings) that have recently come up and led to this idea?

It's certainly plausible with your situation--there are likely a lot of undiscovered point mutations out there that cause neurological symptoms, and we're going to find more of them as the human genome is unravelled--but I'm always curious as tohow these determinations are arrived at.

(I, for one, never thought you had amyloid in the classic sense--there were too many ambiguous results, and bluntly, if you'd had it this long, you probably wouldn't still be around to post, so I'm glad there's some agreement on that.)