Coffeegirl,
At the same time that you get tested for MG, BE SURE and have your doctor run a blood test for Celiac Disease. It sounds like you might have more than one thing going on, which isn't uncommon with autoimmune diseases. Going on a gluten-free diet might help relieve some of your symptoms - a GF diet will "cure" Celiac Disease and might make some of your other ailments more bearable; however, it won't cure MG.

Here's a link to more information - if you have any questions, I was diagnosed with CD 2 years before my MG diagnosis, and my neurologist seems to think that may have helped make my MG symptoms less severe:
http://neurotalk.psychcentral.com/post8767-2.html

Hope this helps, and hope you get some answers soon!