Ouch sorry to hear about your back, ive had some really bad back problems myself but mine was constantly popping out of place by my tail bone, i couldnt even walk so i cant imagine how bad yours must be.
One thing you might want to check out is to make sure the long term effects dont include damage to the stomach, before i got candida i was taking quite a few back meds that messed up my stomach, especially Dificlinac. Your spine is your #1 prority for sure, but your stomach health is important too. It seemed like i kept losing weight and i always felt hungry no matter what i ate after i took those meds, i noticed they made my stomach bleed too, which still happens 4 years later when i eat foods im allergic to.
Do you have access to marijuana? There is a lady on youtube with a messed up back and all kinds of problems who juices a plant a day, and drinks it. It does not get you high when you take it this way, it is highly beneficial for linking nerves together and making your body more capable of healing. She said it works very well for pain but i havent tried it for pain myself. It certainly helps you heal though, since it contains antioxidants stronger than vitamin E and vitamin D, and has anti-inflammatory properties.