It sucks that you have to start with a rotation you hate. I started with a rotation I hated too. It sucked and it made me sure that the rest of fourth year would suck and omg how will I make it a whole year like this... cue some panic and lost sleep and like ten pounds in three weeks.
But, the next rotation was better, and the one after that was okay, and time passed and it was okay.
I don't know about compassion fatigue - I guess I'm not sure I can help there - but I did want to make it clear that whatever crap you are dealing with in rotation one will not mean the same crap on the other rotations. So hang in there. And if you need to talk to someone - counselor, trusted clinician, therapist - don't hesitate.