Marci, you're not alone. I've always been up front with my employers and have rarely felt that my CF was the cause of not getting the job again (I'm a freelancer). Some of my jobs are long-term, recurring gigs and my employers have definitely felt the impact of my CF, but I think because I was open and honest up front about it - and don't use it as an excuse for anything and ALWAYS do my share of the work - that I've had more support than anything.
I also agree with a lot of what Craige wrote.
Now, to be fair, I have had some producers not come back to me after our one show together. Was it my CF? Possibly. Or it could be that we just didn't click. I can usually tell that the relationship isn't gelling well on a personal or professional level (I didn't deliver the product they quite wanted) and that they'd find someone else next time. That's business.
We should also talk about disclosure concerning employers who will be paying for healthcare (i.e. long-term employment) and those who aren't (typically short-term or crap minimum wage jobs). I have healthcare through other means, so don't depend on my employers for it. If I did, it's quite possible I wouldn't be working for certain ones of them. HOWEVER - I did work for a time as a full-time salaried employee of NYU, running three theatres, and they knew about my CF well before the interview. In fact, had invited me to interview for the job because they'd seen my on-the-job performance DESPITE my CF and were impressed. That kind of thing is what really gets you a job and what ensures you keep it. Craige is 100% right: If you aren't out there every day working the hardest to distinguish yourself as the most valuable employee they've got, then you're not doing your job! At my two main employers (clients), there are salaried employees w/ health benefits and all. I see some of them doing the minimum really. They're not failing at the job, just not really shining. I also happen to know that this has attracted the owners' attention. Come the next difficult economic crunch, when staff has to get cut and freelancers more relied on, it isn't hard to guess who's going to be let go.