First off, are you registered with Disability Resource Center (DRC) at your school?
I had never been in the hopsital for a tune up when I entered college, and actually resgistered with them somewhat by accident... mainly because I knew I would be missing class more than others if I (or others) were sick and didnt want to be docked on attendance issues.
The DRC has been pivotal in helping me get through the semester, even when I was in the hospital for 2 weeks in 2007, I did take an Incomplete in a class (extenuating circumstances) and did get an F... the next semester I was still pretty sick though, and doing home ivs but had another Incomplete in a different class... long story short I got the F turned to a W based on my "unique" situation. If I am not personally coordinating with professors when I am in the hospital, the DRC does it for me and has arranged "note-takers" for me as well.
I am also going to try and appeal some financial aide stuff, but not exactly sure how that will work out yet.
Nowdays, because I need tune-ups quickly and normally for long periods of time as soon as the semester starts I talk with my professor and tell him what is going on, I am registered w/ DRC, only accomadations are normally just to make up HW, Exams, and not have missed classes affect attendance grade if due to CF... I havent had any problems and I do hospitals and home ivs frequently. Every teacher works with me.
Oh and my hospital is 4+ hours away, so we "in house" I cant get a "pass" to go to certain labs or such, but I would definately take advantage if I did have a situation like that.