I'll have another look tomorrow morning as I'm weary now.
I found one called a "3 in 1 shiatsu neck and back massage pillow with heat". The site I looked at didn't seem to have a brand name, but I saw the same item on many different sites.

It's a little like my old lumbar support pillow in shape so you can sit with it behind the neck and back. It might be good because I can use it on lumbar area and even on my calves as well. Has the infrared heating. It comes in 2 sizes so I need to look into that. It has pretty good reviews. I just don't know what powers it. Can't see a lead in the photos. The other little wrap around neck ones don't seem so great after seeing that.

I found great IFC unit site thanks. I'll explore that. All probably too expensive though. TENS would be problematic for me I think but those IFC/IFT ones are different. My nerves and muscles are feeling so overstimulated, I think I need something calming. I found a great physio site with lots of info too. Need a money tree.

Thanks very much for the ideas.