This is me. I've suddenly turned into a wobbly jelly. Well, to be fair, I may have always had wobbly bits as viewed from the outside but now I'm wobbly on the inside as well.
I don't know what's the matter with me but the last fortnight's runs have all been way too hard and definitely in the "practice" run category. (I know the word "fail" is banned here).
I went to the doc's yesterday and he's requested a blood test just to check for anaemia/thyroid issues. As I've had a sinusy head for the last two weeks he thinks it might just be something viral which will go away as mysteriously as it came. If the blood tests come back negative and the symptoms don't disappear I've to go back.
Not sure if I should keep trying to run or just take some days off from exercise.
Anyway, I'll keep you posted.