Do This: If your headache is concentrated on the sides of your head, apply pressure to your foot, just between your pinky and fourth toes. If your headache is more concentrated around the front of your head, use your right thumb and index finger to put pressure on the center of the webbed "V" area where your thumb meets your index finger. Repeat on the other hand.
Do This: Use both hands to press firmly on the bottom of your cheekbones in the area directly in line with your pupils. If you don't have a mirror or screen handy at your desk, try pressing firmly on the outer side of your upper arm, just below the shoulder.