I, too, am having a lot of problems with my voice (a new thing for me). At it's worst, I lose my voice almost entirely. After working way too much for quite a while, I completely crashed the first of April, not able to walk, speak above a whisper, breathe, etc. It was rough. I am finally getting better although still not able to work, walk through a store, etc. However, now at the first sign of weakness, my voice goes. Plus, my voice still doesn't sound normal even when I'm at my best. This is all with aggressive treatment. It's very frustrating!! In another post, someone asked about a sore neck, too. My neck muscles are also extremely weak and my neck gets so sore when I get tired! It's all due to the MG according to my Neuro doc and my general doc. I am sure about it, too. It does get better with rest and with Mestinon - it just doesn't last.