HI there, all your symptoms are suggestive of hyperthyroidism
and my suggestion would be to first get your serum T3,T4 and TSH levels done and then to visit an endocrinologist
who will be able to assess the condition and accordingly change the line of treatment. The lymphnodes
will need to be assessed with an FNAC. It would be a good option to get your thyroid radionuclide
scan done as well to rule out any other pathology. You do need to address this problem a bit more vigerously and do not neglect it. Take care.