I have been experiencing lack of concentration for about 3 years now. I was diognosed with low iron levels and since have got them up but I have never recovered since. My mental alertness and concentration are not what they once were and I have a dull headache day in day out. I have had numerous blood tests but have been unable to find an answer. I am a very active person and compete in triathlons but of late can't find the motivation to train.
If anyone has any suggestions that would be appreciated.