Tsh 0.313 told I have hyperthyroidism, enlarged thyroid gland. Losing weight, heart palp, & trouble sleeping. What are my chances of Graves' disease.

Hyperthyroidism. There are several causes of hyperthyroidism, the most common of which are Graves disease and Hashimoto's thyroiditis. Given the secondary impacts on other organs, the diagnosis needs to be clarified and determined as early as possible so treatment can begin. Both of these causes could be associated with the symptoms you describe. Get your further testing done and get treatment going.