I think you will be able to get off them again. Make sure the doc is aware of your past.
There are supervised plans to get off them. You need pain meds to reduce inflammation so healing can take place.
I believe you know enough to ask for help if you find yourself in over your head once the pain subsides.
TALK to the doctor! TALK to an addiction/pain management person.
I think the most important thing is not to let your thoughts get carried away. There is a way out and it is honesty. Don't get spun out on the panic.