A small neck swelling is common and usually highly treatable. The tests ordered will pinpoint the exact cause. Potential diagnoses include a benign thyroid nodule, a fluid-filled cyst, thyroiditis (inflammation), or a reactive lymph node from a mild infection. Treatment depends entirely on the results: an underactive thyroid is managed with levothyroxine; an overactive thyroid may require methimazole; and infections are treated with antibiotics. Many benign swellings require no treatment, just monitoring. These tests are routine steps to ensure accurate care, so please try not to worry. Once reports are ready, your doctor will guide you on the best, simple path forward.

Your symptoms and high parathyroid hormone (PTH) level of 455 suggest hyperparathyroidism, which elevates calcium levels and commonly causes severe headaches. This is occurring alongside your hyperthyroidism. The definitive treatment for hyperparathyroidism is usually a highly successful, minor surgery to remove the affected parathyroid gland. For hyperthyroidism, medications like methimazole can help regulate your thyroid. I highly recommend consulting an endocrinologist. They will check your calcium levels and perform imaging (like an ultrasound) to tailor your treatment. Rest assured, these conditions are highly treatable, and correcting your hormone levels should resolve your headaches.