Im in the same spot as you makbike, but all my symptoms are, well let's say, below the neck, except when my stomach wants to do a reversal on the laws of physics and with fever and body aches. I've been on bed rest for the past 4 days and today I finally feel ok, but, knowing that my immune system has been fighting off something vicious, I didn't ride. Depending on how I feel, I might take an easy ride(going pretty slow and not straying far from home) Sat and Sun, but that only depends on my body.
The best advice I can give, is exactly what most have said already: just listen to your body. Don't push too hard if your coming off something bad or if your feeling crappy; you don't want to get sick again, that would suck
I hope you start feeling better and whatever has got you feeling yuck is getting handled. Treat yourself first and you'll be riding before you know it.