The only treatment so far is acupuncture and pain meds?
And there are lots of pain meds out there, if the one he's on when it is a problem, isn't strong enough, try a different one or a combination (talk to your vet)
If they think it could be a disc problem, they should try some steroids. 24 hours and he should have some relief from the steroids if it is a disc problem (not sure how it will help for degenerative disc problems).