yeah I've tried everything. For me, physical therapy, exercises, changing the way I sit and my lifestyle has been the answer to back trouble.
BTW, This little massage cushion seems to have jumped up in price (could've sworn it was in the $2x.xx range when I bought it last year), but I can definitely recommend it.
https://www.amazon.com/gp/aw/d/B00BOYA2M2/ref=ppx_yo_mob_b_inactive_ship_o0_img?ie=UTF8&psc=1
The rollers switch between clockwise and counterclockwise every 30 seconds or so, and I've found that this helps hit some of those sections in the spinal erectors and trapezius more effectively (as in placing it in the same spot, as the rollers are going one way, it's just OK, but then they reverse direction and it's, "Ohhhh yeahhhhhhh...
that's the spot that's bothering me").
Has the infrared heat thingy too (can be turned off IIRC).
Even comes with a 12v cigarette lighter adapter plug, so you can use it in the car on long road trips (ideally as the passenger, not driver lol). I know some folks with back issues, and their back issues tend to be exacerbated by long stretches in a vehicle.
I bought this thing after making the mistake of manually shoveling 12"+ of heavy, wet snow in early 2018 when I got home from work. The push-plow method with the shovel didn't work with that much heavy snow.
I figured, "Eh, I'm in decent shape, and strong enough, so here goes...". To clear the snow over the ridges beside the driveway, I simply slammed the shovel in to get a big scoop of snow, then using a power clean with a twist, threw the load of snow over the ridge.
Made it through the 90 minutes without needing a break. After waking up from a nap, my lower back said, "Hello, you dumbass".