Uh...OK....

Ate any bananas lately Wessle ?

You probably smoked stems, they give you bad headaches.

Seriously though, drinking plenty of water helps because it could also be due to dehydration.

could be dehydration. Drink plenty of water.

I'm not going to lecture you about drug use. Because you're a troll.

He actually does it though....

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. 

Lecturing or trolling ?

Danm, for me its a bloody hangover to bad weed makes me parinoid since its hangover free.

I know he does. That doesn't mean he isn't a troll. He just wants people to tell him how much he's "fucking up his life" and hurting himself. 

I'm not going to venture and say why he does it. But I know he has very little self-confidence, or may even hate himself.

Wow that was Harsh. Also lets see that MD in Psychiatry before you give a diagnosis.

I am in a masters program for psych, but...cmon it's fairly obvious.

Airing all your personal shit online. Why? 

And even if it isn't true and he's just a troll. Is it really that funny to trick people into being serious? Yes. If you have issues.