When I trapped my sciatic nerve I was told to lie flat on my back on the floor close to a wall and then put my legs up the wall so they were at right angles to my back, (which was flat on the floor with my butt against the base of the wall ). I hope you can picture what I am trying to say.
It hurts like he!! so be careful and don't over do the painkillers as it is so easy to just hurt yourself more if you mask the pain.
Take care.
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength