Turned a corner...

I have been feeling totally exhausted all this week, with no obvious reason...I'm not pregnant, had no other symptoms, have been getting my normal number of hours sleep a night. It was like having glandular fever again. Anyway, today I seem to be feeling better, just the normal level of tiredness for this time in the week and I actually feel motivated to do some of the stuff on my 'to-do list' (which I haven't touched all week so far).