Mark, somehow missed your post. I have in fact tried hypnotherapy, probably 7 sessions. Did not provide much benefit other than feeling fairly relaxed. I'm currently trying EMDR to help with this. I'm getting better at brushing off impacts that I can believe are benign, but this one seemed more significant, perhaps because it was so startling since I was trying to relax, I don't know, but given how I've felt the past couple days it's worse than other minor impacts, which normally just manifest in pain where I hit/thought I hit my head.

Thanks for the LED info. While this step is part of Kahn's protocol, it's not the whole thing. A series of LED treatments appear to be a sort of "warm-up", saturating the tissues with light, before applying something more like a laser-pointer that is an actual laser, not just LED. Whether this makes a significant difference, who knows.