Anyone else really fed up with schools?

I'm now moving into year 9. I always end up having a lot of time off school because of my asthma and to top it off i get tonsilitus a few times a year (if i get it once more this year there comming out). The school don't really like the ammount of time i need off school and if i do come in and i don't take part in PE because of my asthma the PE depmartment will start complaining. I don't really care how much they complain as if i can't breath then i don't see much point in struggling around school all day.

Anyone else have this problem with the schools?