[Dark_Swan]

Oh I see. Yeah we can't know what the real cause is. And we are even more confused because of the lack of research on this product. I was reading up on things like nerve damage, trauma, treatments, possible causes, how it happens, circulations problems... I kind of got a bit frustrated at a point because we SHOULD NOT have to be thinking about it this much or be sitting here making assumptions. We are not researchers or doctors. The person who designed the product should have done the appropriate research in order to tweek and modify the product in order to make it safer. Also done more study in order to figure out the possible dangers. The product is effective but needs more work and research.
Don't be too hard on yourself, I really do think you used it like everybody else.  Back in the "happy noogling days" your routine didn't necessary stand out or seemed worrying.