Is it possible for levothyroxine to trigger hyperthyroidism? I started feeling very hyper the 6th day I was on tirosint .It's one month since I was taken off the medication I still can't find peace of mind. I have been diagnosed with Hashimoto's but maybe I should test for Graves antibodies? . TSH has dropped but I feel horrible.Is it possible to have both hypo and hyperthyroidism?