How to go about transferring floors...?

Hi,
I'm a tech and will be starting nursing school in two weeks. I have decided to keep working in my hospital tech position one day a week, my minimum for a per diem. However, i was working out last week and pulled a neck muscle and for the last week and a half I have been requesting to sit for patients. After a few days of this my manager caught wind and I heard she talked to the charges and tech to make me be on the floor! All i wanted was two weeks (of three days) sitting! she is very mean to talk to and I'm very with it and feel i am a good asset to her floor being in the RN program. I have long wanted to transfer to the other floor with a nice manager and now i must. HOw do i go about this email the other manager talk to my evil condescending one? Any advice would be great!