Karen, There are a lot of reasons for an increase or decrease in the immunoglobulins. I can't believe they didn't do the subclasses for IgG when they found an increase to see if there is a particular subclass that is increased.
These are basic but helpful to some degree. You need an immunologist or a good internist to explain it.
http://kidshealth.org/parent/system/...globulins.html
http://labtestsonline.org/understand...ulins/tab/test
http://emedicine.medscape.com/article/136580-overview
http://www.mayomedicallaboratories.c...erpretive/8160
I really hope that they didn't miss a thymoma. Since it's still growing, that could be a concern.
Johns Hopkins has some of the best MG experts around, allegedly.

Why they haven't referred you on to one is bewildering.
You need an EXPERT, like Tracy said. You are sick, need help and some more answers about your health. I am so sorry you are dealing with this. A good doctor makes all the difference in the world. It takes more than expertise to be a good doctor. It takes them being a good human being too.

Annie