You should have in your possesion the hospital's CODE OF CONDUCT policy and procedures manual. You should have received it when you were first hired on. If not you have a right to ask for a copy. Also, I would ask specifically the reason for the leave of absence. Write everything down as to...
Fired from Job
Depending upon if you have a union shop you should check with the Human Resource department as to what their policy is. If it is written then you have no recourse other than to accept it.