I know this is not true for everyone, but I had good success with some physical life changes that really helped with sciatica.

Stopped wearing a leather belt, stopped having anything in my back pocket, started sleeping with a pillow between my legs, and paid more attention to how I was sitting. These, along with core exercises, brought flare up from ~weekly to ~yearly.

Just sharing my experience in the hope that maybe it’s helpful. Sciatica sucks.