Peg, let yourself get better and then get back at it. Working out when you're sick or overly tired can lead to overtraining - take a look through Lisaf's gym log; she was forced to take a few weeks off for this very reason.

You'll be back at it when you're well - remember it takes 6 weeks to grow muscle - it takes weeks to lose it as well; it wont happen overnight. Rest and get better.

Nat