Nancy, I read this post this morning on my spartphone but couldn't post a reply till now. Marilyn's sister had sciatic nerve problems but I don't know what flared it up. A lot of different things can flare it up.
Anyway, the chiro couldn't do anything for it and neither could the medical doctor. Both of them just shrugged their shoulders and told her she would have to live with it. Out of desperation she went to a massage therapist and he cured her. I think his specialty was sports therapy of some sort. Anyway, it worked for her. Hope you get relief soon. Jim