I have dealt with sciatic issues for 30 plus years. To shorten a long story, I had 3 surgeries at L5-S1, with the third being a total disc replacement as part of a clinical study, in 2004.
My experience is that there many differences between patients with similar sciatic issues. A professional with a lot of experience is where and how to get knowledge of, and relief from, spinal problems. Anything posted here is opinion based on others experience, which may be helpful, but unlikely to be the solution for an individual.
My experience for pain relief calls for nsaids, excersises and stretches prescribed by a professional, and, I love ice packs.
It still flares up ocassionally, sometimes, seemingly, for no reason. I know I have to give it rest, nsaids as needed, and an ice pack numerous times in a day, including sometimes when pain is at a low level or not present. I try to be proactive keeping the pain to a minimum.