Can anyone give me any hope about my sword interest?

Do your ailments hurt? You never seemed to mention that they did. If they don't hurt, then you're in luck and will pretty much be able to do what anyone without the ailments is able to do with a sword-although it MIGHT be a little more difficult. If they do hurt, you may be able to still do sword tricks, but you may have to use different positioning, different stances, etc. meaning you'll be more unique. Just remember, if you're going to buy a sword and you plan on using it, buy carbon steel and not stainless steel! Best of luck.