Hi, I am 48 and diagnosed over 2 years ago with underactive thyroid. I am on 100mcg daily. Last year I went through a phase of having periods every 2 weeks and being very heavy paintful etc. At that time I posted a question and got great responses from others who had similar symptons. Since December I have not had a period, have all the symptoms but nothing. Has anyone else here had a similar problem. I am aware that due to my age it may be a hormonal change going on in my body but I have also lost half a stone in the last couple of months and just interested to know if being underactive may be a contributory factor before making the dreaded GP appointment. Any advice greatly apprecaited.