@boomerang,
What does he do on the days he's home "sick"?
Is he allowed to get out of bed? allowed to leave his room?
Most of my friends with kids go the "you're sick, you'll need to stay in bed with a book" route. No tv, no computer, no being oot and aboot. They usually prefer school to "in bed, with a book". My friend P was particularly evil
she'd turn off the radio, and keep the curtains drawn, make 'em stay in bed the entire day. The poor kids were in isolation - with a book (both boys hated to read independently til they were in their early teens). Worked though. I'm not sure I could ever have pulled it off.
... no interesting meals either - no grilled cheese, hamburgers, no "what do you think you'd like to eat". Clear broth and saltines.