Jackie, you and I seem to be running pretty parallel on this!
Get this. Ok, the stim works wonders for the burning leg pain (like yours).....but I've been having one @#$%^ of a time when I go to work or like you, trying to shop with daughter and get around...and then my lower back just starts aching and it continues getting more intense until I'm practically in tears and it becomes PIERCING in the mid-lower back.......!
SOOoooo I thought, hmmmm what if it's the stimulator that actually CAUSES the lower back pain (back pain was NEVER an issue with me) ..... so I turned it OFF for an entire day......yes, the burning leg pain returned, but ZERO back pain!!!

And today, intense day - relocating office and reeeeally on the move.....My stim going and I'm buzzing right along......then I feel the back pain begin to set in and get more and more intense.....so I turned the unit OFF and I had ZERO pain for the last 5 hours at work! ZEERRO!!

WTH??
If I'm at home taking it easy, reclined watching TV or here on my laptop, everything is fine......SCS feels GREAT in the legs and takes 100% of the burning neuropathy away.....but the minute I try to become active the hot poker starts sticking me in the back

Time for a tweek.

Mental note to self: QUIT PROCRASTINATING!!!!