Also like 3 years ago, I was doing the weird head bobbing motion and I got a migraine aura for the first time after which really scared me. Coincidence possibly, but I don't think so, and I worry then that I caused brain damage or something. I know a lot of people get migraine auras after neck strain, so it could be as simple as that, or as complicated as some brain damage. I feel so angry because this is something that I did to myself and I'm really scared now that it could kill me :(
Maybe it happened because of something as simple as neck tension from doing the head bobbing rather than anything sinister