Since diagnosis 30 years ago I was put on 200 mcgs of levothyroxine and have remained at that level until a year ago. During this time I had no problems and no awareness of any consequences that could occur when suffering from Hashimoto's syndrome. Four years ago I started suffering from stomach pains and bowel problems and my Doctor suggested a wheat free diet. This certainly helped but my problem returned again about six months ago. When I complained of tiredness to my Doctor about a year ago he increased the level to 225 mcgs but at the next blood test my levels had risen too much so we agreed to revert to 200 mcgs. . However eighteen months ago my heart went into Atrial Flutter but came down of its own accord. Seven weeks ago I suffered again from Atrial Flutter and was in hospital for 24 hours when they put me on Beta Blockers and Warfarin and reduced my thyroxine to175 mcgs. Since then I have felt steadily worse and have a fairly constant pain in my neck in the thyroid area. Being nearly 78 years old, I have never queried what the Doctors say, have no knowledge of my thyroxine levels and had no idea that everything I suffered from could have been due to Hashimotos.