Hi. A couple of times today, I have had what feels like a vibration on my head and it sort of feels like it knocks me off my balance for a split second. I'm really scared that this is something to worry about. I have been doing so well with these worries about my head, but here I am again. Can anyone relate to the vibrations? It almost feels like a power surge if that makes sense. Should I be worries? Please help! x