Good morning, Slip! Have you tried Tiger Balm patches for your back? Wonderful things, those; great for when you feel like you've been tested for malleability.
I've used many patches, but they don't stick to my back. So I use StoPain. It's 8.0 percent mentholatum. It's a spray or a roll on. If that doesn't work, I use Motrin. If I go into spasm, I have to take an Rx that knocks me out for 12 hours. And I hate those pills.