I found this device on the net, from a study that a Dr was conducting in the nhs. There certainly not cheap
There’s 2 models,
£499 & £799
Alpha-Stim electrotherapy device works by transmitting a unique, patented electrical waveform to modulate the cells' signals to return to baseline, normal functioning—significantly reducing pain, anxiety, depression, or insomnia without medication. 2 May 2019