Hey Erin,
Yes, it is very serious and I hope everyone tells their doctor. My GP knew I had it and I told my neuro the first time I saw him in 01. Mine is so much better now compared to what is use to be. I didn't know other MG'ers had it too because I never met anyone with MG or 'talked' with others with the disease until I found this incredible site and all the wonderful people here! I hope you are feeling better today. Take care.
Big Hugs,
Pat