My concern would be the issue with your Thymus. If they're saying it is large and "lumpy" ... you're (probably) going to want to get it out of you. You need to have that CT reviewed by your Neuro and/or a thoracic surgeon. Become good friends with your GP, you're going to need an advocate to get yourself through the medical system.

MG can be well maintained but is a chronic disorder. You can expect your neuro to put you on mestinon and/or immuno-suppressants.

Best of luck and don't be shy about asking questions.

Brian