dr. appts ruin my life..

i have been having trouble with my body for some time now...i dont know if everyone knows but last year in April i had to go to the dr for a kidney infection. i ended up finding out that i only have one kidney (born that way) and the one kidney that i had had the infection in it.. very bad news that day...so now ive been going to the doctor because they never fully fixed the problem. i have been having blood in my urine (too much info) and they dont know why. so now ive had to miss classes because this is a very huge health problem that could kill me. i hate missing my classes! im getting left behind. my professors dont care. some say that if i had an appointment made then its not an emergency. if only they knew. i had 2 doctors appt this weekend on friday. one was the obgyn doc and the urologist. the urologist appt was no big deal but now i have something wrong with my ovaries. so now i have another test this friday..i have to miss more classes. i dont know what to do. should i wait so that i dont have to miss classes but could become more ill by waiting? or miss my classes and have to retake them just because health is more important. im so stresses out about this and it doesnt help my problems! if the doctors office was open on the weekends then that would solve all my problems!