Hi Dear, Welcome to HCM. Understanding your concern. As per your query you have hand tremors along with headaches and leg pain . Well there can be many reasons for symptoms you mention in query like low blood sugar , too much coffee and tea or essential tremor. The head ache and leg pain can also occur due to viral infection or arthritis or iron deficiency .If your problems with your fingers occur only during specific tasks such as writing, one possibility is what is termed focal task-specific tremor or dystonia. Performing the same task in the same position will repeatedly trigger the tremor/dystonia after a certain amount of time, but performing the same task in a slightly different position would not. The symptoms can also be first sign of Parkinson’s disease or psychogenic tremor . I would suggest you to consult neurologist for proper examination . Doctor may prescribe atenolol , gabapentin , clonazepam or botox injections . In some cases doctor may recommend physical therapy or surgery . Doctor may also refer you to9 orthopedic surgeon for muscle and bone problem. Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari