I want to go to school but I'm too sick to attend

I'm a high school senior who's been truant since middle school. I have a few illnesses and was hospitalized for about a year in middle school. After that, I couldn't catch up with the entrance exams and ended up going to a correspondence high school. Right after being discharged, I was able to go to school (middle school) every day, but since starting high school, public transportation has been really difficult, and I've barely been able to go. Until last year, I had home nursing visits, and often ended up at the general hospital after going for IV infusions at night. I almost had to be hospitalized a few times, and there was a period where I couldn't eat and was bedridden. However, the school, perhaps being overly optimistic or ignorant, keeps suggesting I attend more classes in person, saying things like 'Why don't you try coming to school a bit more?'. Like, if I could go, I wouldn't have chosen correspondence school, you know? And after the argument with the school regarding my career counseling, I haven't been back once. What even is correspondence school... (I'll post again later because I want to talk about the career counseling issue too.)