I went to see my GP about 18 months ago & he wasn't very interested. It appears the problem is muscular, not structure. Could go for an xray but that would only highlight arthritis & they cant do anything for that anyway. It may be caused by my work, but proving it would be extremely difficult & if I make too much noise could be causing problems at work

Monthly visit to my Chiro keeps the pain levels low & managable without the need for pain killers
I think after 18 months he could probably survive a second visit.
<mandatory everyone's back pain is different disclaimer. God I've read a lot of those.>
Ask him if your local hospital has a pain clinic. They are worth a try and why I managed to move at anything faster than a walk with my back pain. Somewhere near the beginning I'd had a specialist talk to me about the cycle of pain, how the back is particularly susceptible because it is particularly prone to problems so we've evolved twice the number of nerve endings to check on how it's doing, which is why when it's doing badly it hurts twice as much (yes, simplified, no I didn't go and do clinical trials to check if it was 100% true, it's an anecdote, sue me).
So, after a few years of trying loads of stuff I end up back at the pain clinic. Here's the thing, if you have one, check how they work, my one didn't do 'follow ups' in any way at all. They'd do a thing (say steroid injection directly in to the spine) and then leave you. If it didn't work you were expected to tell the doctor, decide something else would (even when the procedure had a 30% success rate so was likely to fail first time) and then refer to them again. They didn't mention this, led to a lot of waiting around. In pain. So, they decide after a couple of spinal injections to do an injection under X-ray in to 6 nerve endings around the problem area. Steroid plus anaesthetic to basically kill them off for 3 months. If it works, they'll do it again only with lasers. Do I sound desperate here? It had hurt a lot and been systematically ruining my life for half a decade and more. Anyway, rambling story shorter, the 3 months pain free has turned in to a decade plus. Turns out the pain cycle the specialist had mentioned years previously was what I had. The body was sending crap to fix the pain, irritating the area, sending out messages that there was pain, fixing it with more crap. All it needed was to not have the signals.
That was my back pain, a friend in the States fixed hers by being inverted on a big rack thing and 'stretched'. Moral of the story, don't decide you have X and because fixing X didn't work nothing will, and don't stop pestering people to make you better. The pain clinic exists to deal with you being in pain and make it stop. I heartily recommend it.