I am suffering from myasthenia gravis, which kind of doctor treats this best?

Depends. Generally, start with neurologist. He/she will confirm diagnosis and provide longterm treatments as necessary. In appropriate candidates, thoracic surgery to remove thymus (thymectomy) can possibly cure: http://goo.Gl/3xxmd.
Neurologist. This is best treated by a neurologist although other specialties such as pulmonary specialists may be required as well.

Related Questions

I am suffering from myasthenia gravis, which doctor treats pl. Advise?

Primary, neurology. Initially your primary care or family doctor. But then you will be referred to a neurologist. Read more...
Several. Generally, start with family physician and neurologist. He/she will confirm diagnosis and provide longterm treatments as necessary. In appropriate candidates, thoracic surgery to remove thymus (thymectomy) can possibly cure: http://goo.Gl/3xxmd. Read more...