I'm seronegative too and had the same response to my tensilon test as you did. I also had the same reaction to the diagnosis.... Mya what????
I'm sorry that you have MG but as Abby said I'm glad that you received your diagnosis so quickly. Many people go years before being diagnosed and there are some seronegative people who still aren't diagnosed regardless of their symptoms. Early diagnosis means that they can get started on your treatment plan right away and that's a good thing
This is a great forum with great people so I'm glad you found your way here.
Oh, and welcome to the MG Forum