First off do as the doctor says regarding rehab. Second don't go trying to over do things and screw up the surgeons work. Third be prepared to break the way a person much smaller AND weaker than yourself would. This could mean using as light of a break cue or as heavy of a break cue as you need. My guess would be since you can't use a fast stroke you will need to use as heavy of a break cue as you can handle with a hard tip.
Good luck.