RE: Illness and working out.
I like to push myself into a cardio workout when I feel a cold/flu leaving my body. I feel like it gets everything out of my body and cleanses it. The only thing is that trying it too soon can make it worse. I only push through if I can get through without coughing, wheezing, etc. Ther is usually some discomfort in breathing (b/c I am stuffy or what not) but at the end of the workout, you feel like you can get it all out of you and like you can breathe even better.
It sounds like you had a pretty difficult go of it with the fever and antibiotics. Try doing just some weights (like you posted) and maybe just taking a walk as your cardio for a few days. Get lots of rest. It sound like you need it. You won't hurt your progress by giving yourself extra time to heal.
Hope you are feeling better :)