Pull your hair.

Seriously, just grab handfuls of your hair, and pull upward and outward from the scalp. Do it gently enough that you're not in pain, but hard enough that you can feel the circulation flowing in your scalp.

You might have to do it for 30 minutes or so, but that always helps me.
Also, if you can have someone else do it for you, that seems to have more effect.

Lemon water usually does the trick for me.
And pressure points.

Pressure points

drink water. your brain is dry

Sleep is probably the only option.

Sleep gets rid of it.

Drugs work. Why no drugs?

Massage and then sleep

Scalp massage, ice packs on the skull, and lie down in a darkened room.

Masturbating

Drink water, put pressure on your forehead with your fingertips

Depends on the cause, really.

shove your head in a beehive