I've had a high dose of Steroids, due recurring Mouth ulcers, which I'm not sure were coursed by my under active Thyroid, but they weren't healing and were getting progressively worse, until I was in a lot of pain and not able to eat or sleep. The Steroids have worked and I have finished the course 2 days ago, but I am experiencing Palpitations. I'm on 75ml of Levothtroxmine, I know a too higher dose of this can course this, do you think I need to worry. My last TSH level was 2.0 but because I wasn't feeling any better they upped my meds from 50 to 75ml. I do have an appointment to see the Doctors Next Friday.