It started Thurs evening, had an early night and woke up Friday feeling back to normal. Since then it has happened every day for an hour or two. Very odd, can't think what it could be, particularly as it comes and goes. Life has been hectic during the last few months so could it be stress related?
I'm generally in good health, prob could do with losing about a stone. Eat well, don't smoke, exercise occasionally, possibly drink too much red wine now and then.