I'm after recommendations for a basic and relatively cheap e-stim to use on a portion of my back..

I have nearly all my front abs and a lot of my back muscles working, but there is a large numb & paralysed section on the right side of my back that extends up to my soulder blade. I've now noticed that the kidney area below the ribs is starting to bulge out, especially if I'm doing something requiring a lot of strength, or if I tense up from a bad bit of neuro pain. So, I'm wandering if I could use some kind of electrickery to strengthen this area?

There's also a small section of lower front abs, on the right side again, that might benefit if this works, but it's not as bad as the area on my back.

Thanks a lot,