For the past 6 months or so I have been feeling off in the late morning. Light headedness and sort of 'out of it' like I have some sort of virus. It can last 2-3 hours. I have tried different things including stopping coffee in the mornings but nothing seems to help. It doesn't affect me at other times of the day. It is very odd. My blood pressure is fine and I am young man and reasonably fit otherwise.