An update... I asked an estate attorney about whether to disclose the concussion or not. He said not to disclose anything they don't specifically ask for.

Another point... The insurance form asks for my "Primary care physician" for records. I went to local clinics for treatment since I didn't have insurance, I paid cash etc. The attorney said clinics do not qualify as "primary care physicians", so I shouldn't list them either.

It's a technicality but I'll take it.