Hi and thanks for posting to this question. Before of submitting you a possible answer I think you could post in the forum "Migraines" and "Neurological.
I really hope you change the habits of "headbanging". Unfortunately i don't have the best news for you and you should be aware and be careful
According to an article published in the Guardian: Headbanging does create risk of brain damage, says study
In their site they explain the following "We identified a definite risk of mild traumatic brain injury from headbanging," Dr Andrew McIntosh, of the University of New South Wales (UNSW), told the Australian newspaper. "We would suggest a proper public health warning, as for smoking." The results of his research were published in the Christmas edition of the British Medical Journal.
Researchers at UNSW's school of risk and safety sciences found that risk of neck and head injury was directly related to song tempo. The average heavy metal song, with a tempo of 146 bpm, is likely to cause mild injury to keep reading copy and paste the following link: http://www.guardian.co.uk/music/2008/dec/22/headbanging-rock-music
However the question is that if you do it once you may be able to not have caused that damage but those symptoms clearly represent the risk of following that practice.
I would post in another forum and see what other experts say. I would say go to a doctor get checked and if the symptoms have ceased make sure you stay away from headbanging.
I hope this was helpful