What is a good remedy for sciatica?

Depends. Options to treat sciatics include medications, physical therapy and exercise, injections, and surgery.
Core Exercises. Typically core strengthening exercises are the best to help relieve pressure and forces in the spine. I would try and google some or look them up on youtube to see descriptions. If you can do them yourself, wonderful otherwise ask your doctor to get a referral to a good physical therapist for further assistance.
Varies with cause. Find and treat the area of spinal nerve pressure . Or stretch your piriformis muscle. Begin with activity modification nsaids.Begin with a lumar mri.