Everytime I feel under the weather my tried and tested cure is OXO with bread and Lucozade.
It's soo warming and you literally make it exactly the same as gravy (ok it is gravy)... 2 OXO's, a dash of mint sauce (optional) and some slices of bread. Dip in and eat. It's simple comfort food and quick to make when you don't want to be stood up for too long.
As for lucozade I am sure everyone will agree it tastes better when you are sick. Don't drink tooo much tho or you'll not want to sleep at night.