same as you.. i also wasted a lot of time looking online at which belt would be the best one as there are so many different types!! At the end my mum bought me 1 🥹 cos my back was really painfull .
It’s more expensive than I remember but this is the one that physios would recommend and I got last time: https://amzn.eu/d/6wsT8Fe
I really liked my belt the extra support was a big help just in general. I got mine second hand from Vinted and then sold it when I’d finished with it