Hello i'm 28 years old lady suffering from both upper limb muscular weakness. As I can't do routine work esp above shoulder movement get easily fatigue. Also have problem of mild dyspnoea on little exertion and palpitations. I have hyperthyroidism since 1 years on was on treatment for 2 months. Since last 9 month reports are normal so not taking any medicine. My cpk is normal and ANA by If is weak positive. So I want to know weather I have myasthenia or what will be my diagnosis or which test I should do? My vit b12 n vit d3 normal as every 6 month i'm take supplements. So please kindly give me advice as what I have to do?