I feel your pain. I've been having sciatic pain flares since Thanksgiving. I've been having them since I was pregnant with my daughter. She's almost 16..
Acupuncture helped relieve some daily pain, along with deep tissue massage. Regular stretching and swimming help too. Unfortunately, flare-up for me hit suddenly. When I'm not home, I have found a deep squat that I hold for 10 to 15 seconds stretches my lower back enough to give me a few less painful minutes. It's my go to sciatic relief pose when I'm out in public and get attacked by pain.