I know how you feel. I have constant numbness in my hands and feet and the trembling or buzzing in my chest. It is all worse at night. Sometimes I think it is the synthroid, sometimes I'm not sure. I'm going to ask the doc to test for Vit. B deficiency as there is more risk of this with Graves disease and the symptoms are the same. Good luck. I'm not giving up until I've eliminated everything or have an answer.