Since the vagus nerve controls inflammation, it appears that stimulation of that nerve should help with the inflammation from PMR. There is a VERY expensive device that will do that, but others have tried using TENS units for this purpose, and I have been trying to do that with an earclip on one of the electrodes. I can't get it to stay put, though!
The TENS unit gave me some temporary pain easing when I used it on my shoulders, but the pain came back later.