Once you have Graves' disease, you have it for life. Antibodies may go into remission, but they never go away completely. Symptoms will come and go if your antibodies go into remission.
Your endo will probably do a TSI test (thyroid stimulating immunoglobulin), which is the definitive test for Graves' and will confirm it. In addition, he should test your free T3 and free T4, which are the actual thyroid hormones and much more indicative of thyroid status than TSH.