Barb, you took the word right out of my mouth. I have used my TENS on all sorts of pains. In fact, when I had my arthroscopy, I used it to get back to work after only 2 weeks! I had to as I was already in trouble for having had too much sick leave. So I would strap that thing on my leg and secure it with surgical tape, put the gizmo in my pocket and work on. I worked in the operating theatre (OR) and so you can imagine, I was on my feet and running up and down the corridor all day. Couldn't have done it without my little friend. But when my surgeon noticed me adjusting the machine one day and learned what I was doing he was flabberghasted! He'd never even given any consideration that a TENS might be helpful. So, like your doc, he knows tells his patients about it!
You never know what will work till you try!
Mind, one other thought - a person doesn't HAVE to have it prescribed. I bought my latest one off Ebay for about £20 ($40) and it's neat. It's the third one I've had, I wore the other two out!