It may well be peripheral neuropathy. Fingers sound definitely pn but burning feet is a symptom too. Unfortunately it may take some time to reduce after chemo is finished. I found vitamin B helped (just an ordinary Mega B. Check with your oncologist but it's unlikely to do any harm. Paraffin wax pedicures felt good, don't know if they actually reduced anything but when your feet hurt like that, anything that feels good for a while is worth a shot. The nerve endings are damaged but can recover. I can't comment on thongs, I have never been able to wear them and my toes were particularly sensitive so I never left them uncovered when I had the problem - the thought of bumping them on something or worse, someone standing on my toes was horrible. Best wishes.