You are gaining wt because of
thyroid problem you need to check thyroid function test every 2-3 mths and take treatment accordingly I.e . Increasing or decreasing doses of medicine by endocrinologist
Hand pain and shoulder pain is due to joint problem to be dealt by orthopaedic surgeon
Next Steps
You need consultation with endocrinologist 1st.
Health Tips
Take care of diet and must take iodised salt