Hi Davey- I really feel for you. I know what it's like to have unrelenting pain and limited resources to treat it.
I had shoulder surgery recently, after having been clean from opiates for 8 months. I did use pain pills (as prescribed) for three days. After my pain was manageable my husband got rid of them. I also had him dole them out to me at regularly scheduled times. He had complete control.
Is it possible that you might have someone that could help you out with this?