I have had Hashimoto's disease for 40 years. Have been taking 1,25 mg levothyroxine without any problem. Recently I had a severe episode of palpitations and ectopics . All tests ere normal. Troponin cardiac enlymes etc. No T3 and T4 are ithin normal range but TSH is 8.38. My face swelled up plus palpitations. I am not taking the thyroid hormone at this time.I am on Lopresor and this helps. I am about to leave for England and I am concerned. Is there anything else besides Lopresor I ahould be taking? Ho long before my thyroid function returns to normal levels. Thank you.