Bro, if you still feel sick, then wait it out some more. I know it's hard to do, because you just feel that itch to run, not walk to the gym. I was sick from monday, until just today. I stayed away for as long as I could. But I ended up going in wendesday. My strength sucked, my lungs sorta hurt from coughing so much. So, I cut it short went home and rested. Besides, not cool to get other bro's sick.
So, you lose a little weight. Your strength may go down a little too. But your body is funny in some ways. It seems to remember where you were. So, anything lost comes back real quick. Just use that as motivation when you get back to the gym 110%.
But if you feel you really must get there. Just do some light sets, stay no longer than 15-20mins. Then get back home and rest. Don't worry about it bro, we all get sick from time to time. Just remember that you come back with a new desire, and drive to get even better than before! Good luck, and hope you feel 110% real soon.