Back injuries are no joke i did my back in at work and it persisted for about 6 months- a year and still pops up every now and again , its good you can still move and go for walks, that meens it may be aomewhat manageable. The nhs were a joke with me too, infact my drs were close to useless, i actually found with me working out actually helped, strengthening my back muscles seemed to stabalise the problem abit however i only used light weights and had to really only do certain movements, also i wouldnt advise that if you dont know the issue because in some circumstances that wouldnt help at all. But enough of my rant, hope you get better soon