I'm right there with you - I have an upper respiratory infection, have been sick since Monday afternoon. Exercised Mon, Tues, not Wed, got a steroid shot on Thurs & did some yoga, can't stop coughing at night so have only slept a few hours since Thursday night. Didn't exercise yesterday, am sitting here now trying to decide if I should make myself do something today. I'm afraid that the coughing will make it too hard to breathe.
I will tell you that I feel exhausted, so it is probably wise for me to take today off too. Not a bad idea for you either - take a couple of days to rest and maybe you will head the sick off before it settles in. And, that is really hard for me to say, as I'm a little crazy obsessed with exercise at this point. Earlier this week I might have said differently, but after six days of sick I'm seeing from a slightly different angle.
Feel better!