Also notable is that an employer (of more than 15 employees) has to treat RA sufferer like any other person protected under the Americans with Disabilities Act. Your employer (again, if they employ at least 15 people) must make reasonable accomodation including going so far as job restructuring (giving you an easier job) and modification of work schedule - unless all of that would cause undue hardship for the company (not likely if it is a large company). You may want to go back and examine your previous job situation to see if any wrong steps were taken.
I'm self-employed now but looking for another "real" job again. I've had a bit of trouble with the last two employers. Nobody ever said anything negative officially, but damage was definitely done, unofficially. I got berated once for wearing comfortable shoes at my old job (a job that has no client or public contact in person). At my last job I was once told by my supervisor quite simply to "do more work" - the day after I came back to work from recovering from a really bad infection! I told the big boss (an attorney) the next day that I was quitting and told him why and he nearly fired my supervisor and then he told me I could have any job I wanted at the company.