I haven't, but my nephew did about five or so years back. He had had a really bad accident where he sort of blacked out very briefly. He didn't feel quite right cognitively for a while. I know he went to Philadelphia to some ultra specialist a couple times and had other tests, too, like an MRI, etc. I forget exactly what that specialist's title was. Something I had not exactly heard of.

I felt quite cognitively affected in the past, too. Though I didn't have any question based or similar tests, I did have tests like MRIs, a PET scan, and several EEGs. Though your situation could be different than mine or my nephew's, if it's of any comfort, both my nephew and I recovered quite a bit over time, cognitively.