TENS? or another kind of e stim?

If no ins you can get most of the Electronic stims online - I've bought an EMS stim & recently an IF stim from Amazon, under 100$ each.

You can also get an ultrasound , but you would need someone to do your back as it would be hard to reach for good results..

But it might be good to go to a PT or chiro that can try it a few times to see if either one is helpful for you before buying anything..

My chiro also had a low level laser (also called soft laser or cold laser)

You might call around to find out if any places have those for therapy- for my specific pain spots it was great..

I don't know if it any of those will help if your nerves are being pinched, but if mostly soft tissue pains or spasms then they should help.

Maybe acupunture??