Hi Segardin and welcome to this forum!
I started my MG 5 years ago with progressively all symptoms above the waist, but nothing in the legs. After 6 months of treatment, everything went back to almost normal except that my legs started weaking and I'm still at that point now...
I agree with Abby's statements about tests and neuro's who are capable of dealing with MG, try to find one!
I would advise you to be careful with drugs and medications, some can really worsen your symptoms , see for example:
http://dig.pharm.uic.edu/faq/myasthenia.aspx
Maurice.