I have sciatica and that is where the pain is. Doesn't have to be in your back at all, which I know sounds weird. I have had it both ways, with pain in my back and just pain going down the side of my thigh into my knee or down to my ankle, or wrapping itself around my thigh and into my groin. Try putting a pillow between your knees when you lie down, always lying on your side. The pillow between your knee REALLY helps! I hope you feel better soon...it's a horrible pain, believe me, I know
Also, my friend ended up having hip replacement surgery and before the surgery, her pain was mainly in her groin. Not trying to scare you, just giving you more information.
Good luck and feel better,
Fibromyalgia, Osteoarthritis, scoliosis, microdiskectomy C5/C6, bulging disks L3/L4, compressed nerve L5/S1, disc compression L5/S1, IBS, hypothyroidism (now FINALLY well controlled) Also angioplasty, and angiogram, high bp, well controlled, high chol, now normal, well controlled