4 screws, two pins, and a Tantalum cage in my L5-S1. That went in, in 2008. I'd love to say it was a total success, but it wasn't. My life IS measurably better than it was then though. I can function, and make it through a shower or a sit on the pot, without having to lay down flat until the pain lowers enough to be able to continue. That was how bad it got, I am nowhere near that now, though better living through chemistry is still a part of my life.
Did lots of the PT, and physio, used way to many over the counter drugs, and put up with pain for far longer than was reasonable, for the sake of keeping my job.
End result was a pretty severe extrusion of the disk, out two sides of my spine. Somewhere around here I still have a copy of the MRI that showed exactly what was going on. Really obvious, even to someone that only half figured out what they were looking at.
While there are a fair few things that have been mentioned, that will aid in being able to get on with your life, like losing weight, core muscle training, and such, which are pretty damn good ideas even without pain to remind you that you should put in the time, I would really suggest trying to get in and see someone qualified to give you a reasonable assessment of what condition your back is actually in. If it means digging in to your pocket to pay for a MRI, it might be worth it. Dunno what the local fees are, but it was around $800 per session, in the machine at the cash clinic that I went to in Edmonton, Alberta, Canada. Or I would have gone on a wait list...
In any case, I ran across the modern equivalent of snake oil sales in huge volume, of folks offering miracle cures for back pain, and offering various quackery ideas as to why you didn't need surgery. It's a huge business. Try not to dump any more money into it than you have to.
Cheers
Trev