Wow, Those hormone stimulating drugs are way off label. One is used for breast cancer, the other for infertility. I doubt many HRT specialists in the US would be willing to prescribe them for concussion. Off label prescribing would make insurance coverage difficult.

The online comments show them being prescribed by the sports performance focused doctors, often with steroids and such.

I'd stick with pursuing a neuro endocrinologist.

My symptoms were very similar to your son's. My mind was settled down with an SSRI. I eventually replaced the SSRI with 5-HTP and L-Theanine. The sensitivity to movements went away when my upper neck was treated and allowed to heal.

But, an important part of this is quite simple. Every head injury is different. Doing the various diagnostics to cover all the bases is worthwhile.