You seem to be having enlargement of the
thyroid gland which is reported as multi nodular goitre according to ultrasound scan. Your FNAC proves it to be benign condition. You need to get thyroid function test. If it is normal then Medications won't solve your problem. Either you can wait and watch or undergo surgery. If there is decreased thyroid function then medications will reduce size of the swelling
Next Steps
Consult nearby ENT specialist or endocrinologist for confirmation of diagnosis and appropriate treatment if required