Hello I am a 36 years old male having niddle prick like sensation for last 1 month intermittently not daily on left sided top of head at a particular point that comes suddenly last for few seconds then automatically goes off. Then sometimes I feel mild pain or discomfort that radiates to left sided eye, Ear then back of the neck that also goes off automatically. It's not pulsatile. Pain is also not severe it's mild but make me feel discomfortable. Sometimes while rotating my neck  I also some kind of irritation on that particular point of left sided top of head. Other than that I don't have any other problem regarding that. Kindly tell me what might be the cause and what should I do?