Good morning (I hope). I really feel for you as I have also suffered with sciatica for quite a while. Like you, at times, it was on both sides at the same time. Just diabolical! I was so much at my wits’ end that I stupidly spent thousands of dollars at this scammy clinic that had just opened ) and since closed!) that said it could help me. It was quite true when I was on their stretching table, but THE EFFECT DID NOT LAST. I then saw this advertisement for a decompression belt to relieve sciatica. I did not know if this was a scam or not, but I needed relief! All I had to lose was the cost of the belt. Turns out it was one of the BEST purchases I have EVER made. It is even useful if you have lower back pain, and not always sciatica. If I remember right at first I wore it pretty constantly during the day for about two weeks and that got things under control. The belt comes with a pump that allows you to expand the width. After that, I started putting it on (without the pump) first thing in the morning for an hour or two. It just FEELS SO GOOD! I still have the very occasional mild flare-up that disappears nearly immediately.
I don’t know if there are other brands on the market, but I purchased Dr Ho’s decompression belt, the one with the red round sticker on it ( the one with the blue sticker is more expensive and is for upper back pain also). It costs $104. at Walmart’s here in Canada. I really hope you try this belt as IT WORKS!
Good luck to you!

Francine