Nicole,
If you get SSI & SSDI, you would probably get bumped of the SSI part if your new husband has a good job, but I think you should still get disability because you getting married certainly doesn't make you any less disabled. I am no expert, but this is what I think.
As far as his insurance goes, if it's a company with many employees & they offer insurance coverage for spouse & family, then it won't cost any more for that family coverage just because you have CF. I'm not sure if Medicare would be your main insurance coverage or your secondary ins coverage if you would get on his policy, but either way, that's more insurance coverage & I think could only be a win/win situation as far as insurance goes.
The SSI you would possibly lose is another story, though. We can't win 'em all! Happy Thanksgiving.<img src="i/expressions/face-icon-small-smile.gif" border="0">