You're right about the boxing.

I'm just worried that the jarring caused by me stopping my "air punches" sharp and with full arm extension was enough to jar my brain back and forth. I put an ice pack on my neck and lay on the couch on Sunday, the armrests don't have thick padding and I slept badly that night. I've become paranoid that resting my neck on the sofa might have also impinged my brain stem. I'm a mess right now.