Hey Frank,
Welcome to the group! It's good to hear you are recovering nicely from your thymectomy and there wasn't a thymoma. Are you having any symptoms since your neuro increased the mestinon that you didn't have before? You could call and ask your neuro if he/she would decrease it and see how you respond to a lower dose. I agree with Joanmarie that he may have raised it because of your surgery, but you do need to let the neuro know of any changes in symptoms or new ones. They could be cause by the increase. Please keep us posted and again, welcome!
Hugs,
Pat