Yes, call the doctor, check you head injury doesn't have long term effects and otherwise, if it bothers you a lot, hten go see a therapist. I have these things too, btw, on and off, not very frequently,, without a head injury. It's ok to me, as these are not terribly intrusive when they happen (plus, I'm already in therapy, though for other things), but if they are to you, no shame in getting help