G3 I have chronic lower back pain, it has to do with the shape of my spine, and my vertibraes are very loose there also, so there is no solid support for my lower back. Same as you, I can't sit for too long, or bend too much. I have to remember my limitations.
However, due to the discovery of bee stings on my lower back, I am more flexible and can be without pain for longer periods of time, and I'm still able to work as a ashiatsu massage therapist, which is very physical work. Two, years ago I started stinging a couple of times a week, two bees, one on each side of my spine, about 3 inches below the belt line. Now, I sting in that area as needed, which is maybe once a month unless I've over done it, then I go back to my one week regime and that put it back in order.
Let me know if you are interested in learning how to sting your lower back, or if you would like to know who the apitherapists are in your state
Jen