Greetings, sorry for the pain. Not to worry. Pain killers are useless, just stop them. Your husband has flexibility issues with regards to joints that is the reason he has back pain. Don't worry about disc bulge, it is given too much a hype.
Next Steps
get a massage by an ayurveda or see a physio for trigger point release and massage, your husband's pain will be cured
Health Tips
if any other questions or concerns do let me know.