Your anti-thyroid peroxidase antibody level is very high and may indicate a thyroid auto-immune disease like Hashimoto disease or Graves disease.

When you see your GP I suggest that you get him/her to arrange for an anti-thyroglobulin antibody test. Serum levels of these antibodies are also raised in most cases of Hashimoto disease or Graves disease.

When those results are available your GP will (depending) be able to discuss treatment options with you, possibly after a referral to a clinical immunologist.