My sciatica improved noticeably when I lost weight.
I wasn’t particularly big but losing about 2st through diet and exercise seemed to end the sciatica. I have no idea what you look like so this might be a stupid thing to say if you’re a size 12 or smaller.
Unfortunately I tend to ‘tether’ (not trapped) a nerve in my neck which is incredibly uncomfortable through my right arm. It’s like I banged my funny bone, but it will not ease. I’m currently treating it with cocodomol and a hot water bottle (and a lot of swearing).
I hope you feel better soon. An electric blanket might help you sleep well and I believe sleep helps any healing process.