Dear Debbie
Do not give up. We may not all be built exactly the same but we're all from the same factory, we're all human. Our individuality and the time course we've endured our conditions necessarily have a bearing on variables such as electrode positions, current density, length and frequency of treatment, etc.
I hope to apply tDCS for tinnitus. In the studies there are many individual factors why some respond and others don't. Maybe given the correct protocol, we are ALL responders, all healers. So maybe it is our task to try out different protocols until we hit the right one. There lies hope.

It would be interesting to learn what works for whom and for someone to tabulate the data as a cross-reference guide. My own experience has become more severe and gives me no choice but to give it a big try. How long have you been using tDCS, with what equipment and what protocols?
Please don't despair, the science is solid and I think we can all be responders,
no matter how resilient the condition appears to be.