I can't really comment knowledgeably on this. I've had low back problems pretty-much all my life. And along the way, I ruptured a disc that impinges on the sacral nerve. So I have sciatica as well. I never did have any kind of treatment for it. And actually, as I have gotten older, it has gradually gotten quite a bit better on its own. PsychCentral has a sister website: "NeuroTalk". There are members there who are knowledgeable with regard to a wide variety of physiological / medical conditions. So one thing you might consider is signing in over there to see if there are members who have useful suggestions. Here's a link to the NeuroTalk website:

NeuroTalk Support Groups