Your treatment plan is perfectly fine.
Hashimoto's disease is a benign hereditary condition.
Nodule may be due to raised TSH
as a result of hypothyroidism
Cancerous change shows rapid growth of the swelling, hoarseness
of voice, difficulty in swallowing/breathing, pain on swallowing, all due to invasion of surrounding structures in neck.
Sudden weight loss
Your case seems to be non-cancerous.