I have all manner of back issues.
If itās a trapped nerve, is it sciatica?
For a trapped nerve, try a hard rubber ball, position yourself by a wall and place ball as close to trapped nerve as possible, on top is best, then push back against ball and move in circular movements.
Or find yourself a very good, deep tissue masseur, itās not comfy at the time, but provides great relief afterwards.
You can also purchase machines which provide deep massage, but you need someone at home with you to use it on your back.
Or hot and cold works for a limited time.
For me, oral painkillers are almost all a āno noā given that they really only dull the pain but more because they have an awful effect on my tummy etc.
Good luck, trapped nerves are awful!