Blondie, welcome to the forum!

I too am sero-negative, you'll find there are many people who are. It is more common than it once was. I've also had a normal EMG & SFEMG. The hot humid weather is the worst, I don't do so well in extreme cold either. My symptoms are generalized, with my arms and legs being weakest. Right now I take Mestinon 4 times daily and vitamins B6, B12, Folic Acid, and Vit D all under the direction of my neuro. Feel free to contact me!!

Rachel