I totally agree with Kriston - look for some alone time. The sound of silence never sounded sweeter, I bet.
I have me one of those too. What makes it worse is that the school he's in is a "no talking, listen to the teacher" kind of place, so he has to come back to offload to me for 1.5 hours after school. I just go all spacey after awhile. @_@.
So these days, I get him to go for sports classes in the evenings so I can have some quiet. So much better for my brains! On the weekends, he does sports with DH who complains its his turn to go @_@, but at least we spread it out.
