20+ some years ago, I really clobbered my back. I ended up confined to my bed for a month and a half. (not good when you're only in your late 20's)
I completely blew a disk out. They wanted to do a cage in my back...but those were still kinda new just yet, and I'd heard others having issues with 'em...so no thanks!!
What was my other option???
Take better care of myself.
There are these wonderful groomed walking trails around this lake out here. Like a little old man, I'd hobble around the lake with my cane. Then I got up to 2 laps. Then I could eventually walk one with the cane. and one without. By the end of the year, I was sprinting 2 laps around it full steam. (right around 3.5 miles...and a lot of hills too.)
Now, in my 50's, I play racketball at the health club, and I walk to work everyday. (unless it's raining sideways.) I have to bend over quite a bit in my work, and that old back injury still likes to show itself, but as long as I'm taking care of myself, keeping myself in check, and watching how I lift and bend my body, (which is what sets it off)...I can usually work through it in a day or so.
I'm sure being stooped over living in a van is hard on a back...so this is all the more reason.....to TAKE CARE OF YOUR BODY. It's the only one you get!! Get out and get some exercise. Get the blood circulating. Move your body around (and not just to grab another bag of chips!!) Walking and swimming is excellent!!
I'll bet you can work your way through this, but much like your van...you gotta maintain your body.
Hope your feel better brother!!