Hey, Mevan. I think your otho is on the right track suggesting you see a PM doctor. Hope he is a good match for you.
As far as extended release meds there are alot of different options out there to choose from. Oxycontin is the same as oxycodone or percocet with no tylenol but is extended release. There is no generic for this so can be quite expensive depending on your insurance. There are also several morphine based ones too, such as Avinza or MS Contin.
I'm sure your PM doctor will be able to work with you on the best pain treatment for you. As you know everyone is different so what works for one person isn't going to work for another. It can also take time to find the best mix for you. It can also get frustrating until you find the best meds for your pain so try to be patient.
Not all meds have to be narcotic based either. I use Neurontin which is non-narcotic for nerve pain and alot of people add Cymbalta, an anti-depressant which can help with pain.
Good Luck with your appt. and like I said be patient until you find the right doctor & meds for you!