Back pain woes
I too suffered quite a lot from back pain on account of having slipped 3 discs in my lower back from a collapsed scrum playing rugby (IT Stress relief), but also related to an earlier knee injury.
I can categorically state that paracetemol was of no use, and in fact after a while of being on the codeine it's effects became lessened to the extent that it didn't touch the pain any more and I was prescribed tramadol - who's effects I can only liken to feeling like I was walking around on a cruise ship all the time on a gently lolling ocean.
Naproxen was a much more effective anti-inflammatory than Diclofenac which can upset your stomach a bit (still counteracts the codine for a nice balance).
Anyway in the end I'd had a few cortisone injections which lasted a couple of weeks each but the eventual decision was to have surgery followed up by a series of physio with a heavy leaning to Pilates. I stopped taking the meds after the operation.
Other changes I made were - 1) swap the car i had with sports seats to a boring yet comfy car with very good heated seats, 2) got a decent office chair,3) Slept on a hard/orthapedic mattress - soft ones don't help 4) When working made sure I got up every 40 - 50 mins or so and walked (walking really helped things get back in place) around, and continuing with the pilates and back stretched every day (only 5 mins or so).
Now I am fully functioning with only a mild niggle occassionally - if ever I feel dodgy i do a good set of pilates exercises which help your core which holds everything in place where it should (in my case where it was a lower back issue anyway). I've also started playing sports again which again if you prepare properly (pilates and stretching) you can take part in again - yeah I got a bit of stick at first, but I really didn't care as I was happy to be active again after 2 years of inactivity. These days the only thing that makes it stiffen up is a long car journey (i.e. 3 or more hours)