Do you have acess to an after-hours GP clinic? In SA we have GP Plus which you can go to or you could call that HelathConnect number that the gov has been advertising on TV lately. They give you a nurse to talk to over the phone. Its a Federal govt scheme so the number should be available from 12456. They would be able to suggest pain mgt and what to do next for you.

Hope you get some relief - I would seek out an emerg appointment at a good physio tomorrow.