I haven't been allowed many treatment options so I haven't tried TDCS but I use my tens unit often.. though not directly on RSD area I do find that if I use it on surrounding area the spasms stop for brief periods. also I use it on my back and neck to treat for rediculopathy... it helps that with in turn is another minor relief. but like you all know minor relief is the difference of staying in bed forever or lightly living your life.