How will my dislocated kneecap take to heal?

Back in December I dislocated my right kneecap. It was not anything too serious or severe, I went to the doctor and got an xray and was ordered to wear a splint until it had healed. I wore the splint and in about 3 - 4 weeks it was completely healed. It is now February and it feels like I dislocated it again. I can move my kneecap back from side to side, and I have pain when I bend it too far, but I can walk perfectly fine. To make things worse I am in my schools musical and need to be able to dance. How long do you think it will take to heal and how should I treat it?

(Oh and we recently got done auditioning, and I think it hurt it doing the audition dance)

Should I just wear the splint until it heals again? How long will that take?

thank you very much!!

I'm 17 if that helps, also.