Look for a strain with high CBD and CBN levels! Pakistan Valley is a great pain reliever. Try to find something with the CBD > 1.5. Also, ingesting in capsule or mediable form will probably also benefit you more on da pain front. I am sure others will chime in but I speak from personal experience. My back is all fucked up and smoking just does not ease the pain. In fact, the wrong strain actually seems to hurt worse because I become so fixated with the pain. I get high and think "damn my back really does hurt!"
CBD's my man, CBDs (Cannabidiol) because it works to decrease activity of the limbic system.
Best of luck grower 001. Peace my brother.