It may not be sciatica at all!!!
It is probably your PIRIFORMIS muscle located in both arse cheeks, when it gets tight it give all the symptoms of sciatica!
Push your thumb into the cheeks just past your hip bone, go deep and if you get a dull ache then it's too tight and is putting pressure on the nerve.
Go get a sports massage, deep tissue massage and ask them to massage it, they go in with elbows!, it hurts but it will sort you right out, it'll take a few visits.
You can stretch it yourself to check,
lay on the floor, legs out straight
bend one leg up so the foot is flat on the floor, knee pointing to the ceiling,
put the foot on the other side of the knee
If the left leg is bent, put over the right knee,
now with the right hand, SLOWLY pull the knee to the floor
you'll feel the pririformis start to strech, hold for 20 seconds, then release
do it again and you'll get a little lower, hold the stretch for 20 secs, let go
do it again
now repeat for the other leg
it'll help
You're welcome