OP - please ensure your partner is careful with the 'only when necessary' pain meds.
Whilst it is of course important he doesn't take pain killers he doesn't need, it can also be a very poor, ineffective way to use pain meds if he is waiting til he is in utter agony before he takes them.
Some conditions are better treated at the first sign of pain getting worse/beyond what you can manage and then continue dosing at the safe/suggested intervals for a while (a day or two) before trying to back off them again.
I did try to post the other day but got distracted by some glitch (reported to MN) - the talking therapies and mind over matter stuff does have its place.
If you sit about moaning and groaning or just generally focussing on how painful it all is and doom and gloom... then you will feel significantly worse than if you are pro-active about doing what you can, staying busy, distracting yourself etc etc.
But its useful up to a point. It's useful, alongside pain medication. It's useful alongside understanding how various pain medications work, what your pain is telling you, what your body can do/not do etc etc.
As part of the whole thing, it has its place.
As a replacement for pain meds entirely, for everyone across the board - no, it really doesn't.