Turns out most of my anxiety, insomnia, etc sensations were caused by pinched spinal nerves.
I say sensation because I believe, but cannot prove, that my physical sensation led to my mental state. Most diagnosis assume the reverse; that mental state leads to physical symptoms (restlessness, clinching, pit-in-stomach, whatever). I have not yet read anything or met anyone (care providers) supporting my hunch.
So... Anyone experiencing treatment resistent pinched nerves, eg sciatica pain, may want to consider possible physical causes.
In my case, it was collapsing vertebrae due to osteoporosis resolved with a S1-L5-L4 lumbar fusion. Yes, that surgery and recovery was very difficult. The upside is I now often sleep like a corpse. It's glorious.
YMMV.