Spent the lock-down learning a lot about acupresssure. Like acupuncture but with finger pressure instead of needles.
There are many very specific points for sciatica you can apply yourself, or get someone else to help you- a friend or a practictioner, or good acupuncturist.
DD2 came to join us in Tuscany recently and could hardly walk- after 3 sessions on her feet- she was much better- by the 3rd day, she was good to go. All around both heels- from achilles down and around the natural heel shape in a bow, and both sides, and the natural line below the foot, along heel line towards centre of foot- and breathe, deeply.