I hope the belt helps you as much as it has helped me. I wear it when I am doing something that often flares my back up. Long car and plane rides, the stair stepper, classic Nordic skiing. It helps me a lot. You wear it low and snug but not tight. The serola website video was helpful for getting the placement right.
It actually made a recent trip to Disneyland much better for me - DD and DH like the jolting rides like Indiana Jones and Big Thunder Mountain, and I was able to ride a few times without serious regrets. Space Mountain is my favorite!
Take care of yourself! I have 30+ years of a low back injury that flares up with what can seem like no rhyme or reason, so sadly I have a lot of recovery experience. There can be a lot of frustration with 2 steps forward 1 step back. Sometimes the mental part is a bad as the physical, so be patient with, and kind to, yourself.