I have been trying the last 2 1/2 months a similar technology--Frequency Specific microcurrent (FSM) getting it weekly at a PT office. I also went through a period of my heart feeling wacked a bit and maybe increased hypotension....worried me enough that I got a heart monitor to make sure no arrhythmia. But it has been decreasing bad chronic pain I have enough that I have kept doing it in spite of that and finally after about 7-8 weeks my heart and B/P feel better, previous baseline. This is the best thing I have found for chronic pain and "fatigue" in 27 years of searching. I will post more about it later but was struck by your post in my search on here to find others who have tried electro therapies. With FSM I have found that I handle it better if I do shorter sessions.....its sort of like me and mediine and supplements, less is more. And like Wayne I had more pushback at first with herx type things but its getting better. This last week I handled things I didnt think I could anymore!
Right now, I am in possibly Early Lyme/co-infection (Bartonella most likely) "fatigue" by 6pm daily, and have to nap, which is "not me".
Looking for non-drug, non-herbal, suggestions. Including Bob Beck devices. If anybody has used a Bob Beck device, please share your success/lack of. Cheers.