I had to give up the fiddle when I got MG. If you had ever heard me play the fiddle, you would know that this is not nearly as tragic as it sounds. For a while I played the mandolin instead, because it has the same tuning as a fiddle (so I didn't have to relearn the fingering for my tunes), but doesn't require arm and neck strength. That's an excellent solution for someone who likes folk music--maybe not so great for someone who's classically trained. I'm not very good at the mando, either.

If you are adventurous, you could explore some other ways of holding the violin:

http://www.learningfiddle.com/old-time-fiddling/

Best of luck,

Abby