Hi, and welcome. I have been diagnosed with MG although the blood tests (3 of them) were negative, and my first two SFEMGs came back normal. A different doctor did the third one, and diagnosed me on the basis of it.

What your story screams to me is THYROID. It's very common to have thyroid problems along with MG. I know you said your blood test came back normal, but thyroid hormones can fluctuate, especially if you have a nodule that's spewing them out.

I have Graves disease--I've been hyperthyroid on and off for years. That "too much coffee" feeling you describe is very familiar to me! Hyperthyroidism can also cause muscle weakness.

I'm not saying you don't have MG. I'm suggesting you may have thyroid troubles as well. Mostly, I'm highly, highly recommending that you see an endocrinologist. And endo can give you special thyroid tests that non-endocrinologists don't understand. My daughter has been having what seemed to me like symptoms of hyperthyroidism since last November, but her thyroid tests were normal. Just recently she got diagnosed.

Abby