Hi there,
I am so sorry to hear that you are having trouble with your pain. I too have balance problems, this started after a guanethidine nerve block.
I have tried the TENS machine, but it did not work for me. We had the machine set to the highest setting, which was 20, and I could not feel it, although I had a lot of pain due to my RSD/CRPS.
Everyone is different with RSD, but please remember RSD is the worst pain you can every experience according to the McGill pain scale, so it will hurt a hell of a lot.
I hope things look up for you.
if you want to talk I am here.
Pain free hugs
Alison