Quite sad though as most people immediately consider drugs to be the source of it. Really shows how far collective intelligence goes.
The same people would afterwards complain that journalists superficially link violence with video games... tss tss tss
...never heard of someone filling "pinched" there while still knowing plenty of people who consume cannabis ... looked it up though and this seems the best answer yet:
http://www.medhelp.org/posts/Head--Traumatic-Brain-Injury/Pinching-in-back-of-head/show/655975
It seems that you might be having these headaches commonly known as ice-pick headaches. They are sharp, split second pains which typically occur in top and the sides of the head. They are considered to be benign and are seen more commonly in persons with a history of migrane (migraine). They are also difficult to describe as the duration is very short.
These types of pain usually do not require any medication because the pain comes & goes so suddenly/quickly that there's no time for any pain medications to act. In such a case you can try relaxation techniques (try to remain calm and take slow, deep breaths) when the headache strikes.
The diagnosis is based on the duration, time course of the headache along with the factors that aggravate/relieve the pain and the age of the patient. I would advise you to consult a doctor for a complete examination if the headache is troubling you.
