Went to a Chiropractor with a different problem, and one day, he asked if I had headaches. YUP.
He adjusted my neck bones, like wringing out a paper towel for re-use. NO head jerking for me

He kept going up and down my neck, twisting the sections one by one. When he was done, I never had another head ache for several years. Never heard that bone rattling clicking when I turned my head, either.
May not help after taking that ½ gainer off the roof, but, keep it in mind. You DID land on your head-neck.

Good luck with finding "Normal" again
