Actually, you sound very much like me, and I had a successful programming career before becoming disabled. As noted by others, you perhaps could improve your verbal interviewing skills, but interviews like this one are useful for filtering out companies you'd be unhappy at (and I'd add a good fraction of the technically doomed ones).

However I'll note that's one caveat to your "can do almost anything" concept: learning new paradigms, like functional programming if you only know imperative and OO (for me, learning OO when I only knew the other two), can take longer than most reasonable companies will be willing to give you.

Since you do know imperative and OO, if you don't know functional programming it could be worth your while to learn it on your own. Try something like SICP and you'll probably learn a few other worthwhile things.