The ADA didn't do a damned thing for me when I lost my job a year ago, or when I lost my job a couple of weeks ago. If a company doesn't want to make accommodations for your disability, they have an office-full of lawyers who know all sorts of ways around the ADA so that they can get rid of you for any reason or no reason.

It's a nice, 'feel-good' law that has no teeth. Don't depend on the ADA to keep you employed when your illness causes problems for you at work.