You seem to be having diffuse goitre according to ultrasound report. Probably a auto immune condition known as chronic lymphocytic thyroiditis also known as hashimotos thyroiditis. You need to get
thyroid function tests and fine needle aspiration cytology of thyroid to confirm the diagnosis. Usually treatment is with thyroid hormone replacement medications
Next Steps
Consult nearby ENT specialist or endocrinologist for confirmation of diagnosis and appropriate treatment if required