TENS pain management?

I was wondering if anyone has had the TENS pain management unit installed in them. After almost 4 years of none stop pain in my left arm and shoulder and being on differnt types of medications, the pain doc's decided that this would be the best course of action for me. I have no idea how this thing works or... show more I was wondering if anyone has had the TENS pain management unit installed in them. After almost 4 years of none stop pain in my left arm and shoulder and being on differnt types of medications, the pain doc's decided that this would be the best course of action for me. I have no idea how this thing works or if it even works. So I would like to hear from some people that have had this, or know of some one that has. The good the bad it doesn't matter to me, Both sides of having it would help me make the decision if it is something that I would let them cut me open again to install. Any and all website links, would be helpful as well.
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