Thank you very much for your support and advice.
I was thinking the same about him returning to school but not to physical ed, class, but doctor was so insisting on him staying home....
Tomorrow i all try to get an appointment with another doctor. And see what he says.
Tomorrow school starts again after holidays:-( But he will stay home once again:-(
I am also not sure how to arrange for him to be free from physical ed. classes. The school is very strict about that.