I had been under a lot of stress, my Dad died, my husband left, looking after 2 children and also caring for elderly Mum. But thought it was all under control and felt fine and was busy. But felt tired but not unwell. I am 56 years old and was put on 50mg to start on Levothyroxine as my TSH was high although thyroid was low but within range. I took the first dose and was sick within half an hour. I put this down to my son hadn't felt very well during the week so didn't think anymore of it. The next day I took another dose as I had bought up the first dose the day before. Again I was sick 30 mins later. I remember ringing my friend as I felt really anxious and worried and was crying on the phone, it really wasn't like me to be that upset. The next day I kept it down, I can't remember how I felt although I said to my Mum that I needed a day off the next day. So we went out for the day but it turned into an afternoon of stress and evening meeting. Then having to take my Mum home. I didn't feel too well during the evening. I dropped her off and some heavy shopping and put the chest pain down to pulling a muscle whilst lifting the shopping. I drove home but when I got home the chest pain had intensified and gone to my back. I got in and called an ambulance. I was in hospital for 4 days with a heart attack. I had an angiogram and they couldn't find anything wrong and I came home but on the normal heart attack drugs of Clopidogrel, statin and aspirin. Also taking the 50mg Levothyroxine. I told them at the hospital that I was just put on it and was ill but nothing was said about it. I have been really anxious about it, kept thinking any twinge that it was the heart. I have been in a real state. I had an episode of being so worried with palpitations that an ambulance was called and they said I was ok. In the morning I couldn't get a doctor's appointment but over the phone was prescribed valium for my anxiety. I received a telephone call from the doctors saying I should be on 25mg Levothyroxine and went onto the reduced dose which drastically reduced my palpitations. I booked myself into a nutritionist privately and he immediately spotted that if you are over 50 the first dose should be only 25mg. I then did some research and now wonder if my heart attack was caused by the Levothyroxine. Speaking to other people who have been rushed into hospital with chest pains on starting Levothyroxine. Perhaps I just went a bit too far and didn't call the ambulance early enough. Its playing on my mind but I would be relieved if this has happened to others. On Thursday I had an echocardiogram and I was convinced I had a bad heart but nothing was found and the radiographer didn't even see any damage from the heart attack. I now wait till end of May for a follow up appointment. Trouble is I am now a hypochondriac and worry about every feeling, any sign of stress, palpitation etc. I wake up during the night thinking about it and its on my mind throughout the day. I am a nervous wreck and I have now lost all my confidence, I don't even want to book a summer holiday. Has anyone else had anything similar?