It sometimes helps to exercise the torso and leg muscles. The nerve is being pinched most likely because of misalignment or lose non supportive muscles. If you sit too long, or if you are a man, and have a wallet in your back pocket while you sit or drive also can affect this. Try not to sit too long at any given time, and start walking and exercising.
Studies have been done with this particular malady, and they had one test group on med.s and the other doing daily yoga specifically designed to address sciatic nerve pain, and both groups came back with equal results of relief, so if you're already on med.s you may want to start a yoga routine.
Go to chiropractor they help me ! I got a sciatic nerve in my lower back and it affects my left side originated in my left calf of my leg. Since I go to chiropractor, I don't have near as many flare ups ,and also don't hurt as much!