I have the furrowed tongue with scallopped edges (definitely symptomatic of MG). I have tingling and sensory loss and extreme cold sensitivity in my fingers, and some weakness--probably Reynauds combined with MG. We often have other autoimmune things going on with MG. I am seronegative as well. I agree with pingpongman that the rest sounds like the classic presentation of MG, which should help with diagnosis, my initial findings were not classic, but with time . . . b.