Hello I have been on 125mcg. thyroxine for years. Have suffered hot sweats in bed even in winter. Don't feel the cold, very tired all the time, with palpitations and sometimes a racing heart. I am only just thinking it could be due to too much thyroxine and have cut down to 100mcg a day, been doing this for a week. I think I feel a little better but more tired and still throwing covers off at night. I am a new member.