Sorry to post another thread on the symptoms forum, but I forgot to include it in the other and it (seems to be) a totally different issue.

I'm having some issues with leg weakness. It comes on quite suddenly, though it is not severe enough to make me fall or anything. The other day I was driving and and all of a sudden my legs had a faint feeling. Like from the waist down, I was about to pass out. It lasted about an hour or so. I was driving, and still able to drive obviously, but it was quite scary.

I mentioned this on the MCTD group, and a lot of them say they get this when their myositis is active, The doc mentioned a possibility of the polymyosits, I just didn't think I was having symptoms. I guess I am now.