Hi, I had radioactive treatment 1o years ago and have been 'balancing' my health on thyroxine levels of 175mcg per day ever since. There have been odd times when I've felt really unwell but I'm now really suffering. My TSH declined over the last 18 months and so I went on 200mcg, test results showed that my TSH went back to 0.13 but 3 months on I feel awful. My pulse is 58 with gaps in pace,terrible short and long term memory loss, I don't sleep well, my head is covered in a itchy rash and my general mood is all over the place as I just can't think straight. Can I be overactive, my Dr says I can feel unwell if I take too much thyroxine? I'm a 38 yr old female and wondered if anything maybe going on with premenopause? please help as this is affecting relationships, work and I'm really worried.