I think the most important thing was that the blood test showed that your thyroid was overactive. What more proof do you need?
But yes, if your thyroid is overactive, you can have sleeplessness or lack of restful sleep, weight loss, and hand tremors. Some other symptoms can be heat intolerance, increased sweating, frequent bowel movements, difficulty concentrating, hair loss, and several other things. So go see an endocrinologist as soon as you can. It might take a few tries to get the thyroid suppression medication at the right level, but once it is, you should feel better and your weight should return to normal.