Have you been tested for Whooping Cough?
Not wishing to spread fear, but a friend of mine has been really ill with whooping cough for weeks.....it got so bad he had bruising all down one side of his body!!!
He's gradually coming out of it now...with medical help of course....but it took a while.
On the less severe side, it would seem there's lots of sore throat viral stuff going around. I have a dose myself, and just feel so drained and fatigued.
But I do think that we need to re-educate ourselves sometimes [and I'm referring to myself here] about allowing yourself to do NOTHING when we get ill - [other than getting outside for a walk on days like this]. It's perfectly ok to wind down, stop and give your body time to get better.