Hello Joe,
I agree with what yiisd has said, although, the choice for me has been Methadone.
And, I have a "cocktail" of other meds to augment, like her and most others.

Have you ruled out RSD and TOS?

I have RSD and TOS for 26 years, then another accident cause a tbi, and discs in neck and low back and post traumatic epilepsy, PCS.
But, we're just talking about pain here, right?
Methadone is a wonderful medication used properly, plus, it's very inexpensive!
As with morphine, you would want to take it on a schedule, not PRN.
PRN will get you in trouble with most any med for chronic pain. I think.

So, consider this.

Also, I've been able to change my dosage from 15mg. / day to 100, (after 2nd accident), now I'm at 50 to 60.

Be Well!

Pete