Feeling terrible

Apart from the fact that i cannot find time to study all the subjects for the tons of tests my teachers keep on planning, i've got a problem with my female chipmunk Julie, which is making feel devasted.
Two days ago i noticed she was lame on the left back leg, so my mum called the vet  for a visit. After two hours of maths tutoring (i would have had a test the following day), i went to the vet with my mum. He visited Julie and said the real problem was not the leg but her lungs. He added that she wasn't breathing normally and that was not because she was nervous. The second time he hold her, she was riscking a breathing failure and the vet put her face near an oxigen mask because he had noticed her tongue was becoming blue. I was shaking and nearly crying... i remembered the tragic end of Ghiro, the male chipmunk who died 2 years ago after an infection. I started to think that Julie would have died as well. The vet told that the situation was a bit dangerous and since he couldn't understand what was Julie's probelm he suggested doing an x-ray, so that who could better have a look at her leg and lungs. The problem was the anaesthesia: it was a risk because she couldn't breathe properly: although it wouldn't have lasted more than 5 minutes, it was dangerous, but there were no other options. We left her there and i'm now waiting for the vet's response, but i don't feel fine at all.
When i came back home yesterday, i was crying and could not concentrate on studying. I didn't have dinner and i went to bed very early without finishing what i had to study. Today i dind't go to school because i knew i would have got a bad mark, since i hadn't study properly. I spend the morning sleeping and crying and after breakfast i tried to start studying philosophy for the oral test i'll have tomorrow but i was a failure. As yesterday evening, i wasn't able to concentrate on the book and i ended up crying thinking about Julie.
I migh be extremely pessimist, but i don't think she can get well. I feel weak, and i eat just because i need energy to study, and i must not miss another school day.
I can't stop thinking about her, but i know i have to forget her for a fucking school mark.