Yes. MSG and sulfites both are bad for me. MSG is known to aggravate migraines, as Trudie mentioned. I noticed that it aggravates my FMS pain, too.
I was just reading a newsletter from another health site and it indicated some things that can affect fibromyalgia. MSG is definitely on the list as is aspartame.
I know that MSG makes me feel unwell and causes migraines so it could contribute to the fibro issues.