I was on the exact meds(oxy) you are talking about when I walked away from modern medicine around 2-3 years ago. Its not easy to get off of them, but your body will thank you for the change to using pot as pain control instead of Oxy. The hardest thing for me was the getting off Antidepressant medications, even more so than the opiate based beds. Be very carful easing yourself off of those.
A tactic I used to get myself off of prescribed medications is have yourself a good variety of herb to smoke(sounds like you have that covered!). You will certainly want uphigh strains, and powerful indicas. Stay very stoned on weed while tapering off of the scrips. Slowly decline dosage, until you are taking them only when reallllly hurting. Have the uphigh strains close at hand to battle negative mental shit that will likely arise.
Tincture, tincture, tincture...I cannot say enough about everclear tincture. Very effective meds, and very efficient for the amount of weed you use to make it. A fairly heavy dose before bed and you'll sleep like a champ.
Good luck to you
912
P.S. Hey pal we are all waiting for potpros to come back!
Hopefully soon!