Thanks both, I am already taking magnesium glycinate 1000mg a day and a host of other supplements, I am nearly 60 so I am not sure progesterone would help me. I was not in any way blaming Iodine for this, I only felt that it was one of the triggers that exposed a weakness I had, having probably been hypothyroid for many years but other than feeling the cold and having low blood pressure/pulse I had good energy levels, which I still have now. It's a complicated thing for me to get my head round which is why I keep asking questions. I expect to get my thyroid panel results next week which I have done privately then I can hopefully decide which way forward. I am being careful as I do not know how good my heart is, there is a lot of heart disease in my family and I think I may have inherited the tendency although my recent ECG was ok. The UK is rubbish for getting help with this sort of thing, wish I lived in the USA. Once again thank you all for your helpful comments.