Sciatic pain

I had a pre-existing musculoskeletal injury to my lower back from 8 years ago so back pain isn't new. However the past week I've been getting horrible sciatic pain that is only getting worse. Has anyone experienced this and have any suggestions for coping? I stretch nightly and tried a frozen Bed Buddy tonight. I go to the doc on Tuesday and will ask her then but would like some relief before if possible. Thanks in advance!