Get a Chiropractic Adjustment: By placing the vertebrae in the correct position your muscles will start to relax, you will get better nerve flow, and it will help de-stress you.
Warm/hot Shower: Take a warm or a hot shower and let the water beat on the back of your head and shoulders. The heat will help your muscles to loosen up and relax a little bit. For sinus headaches it will help open up your sinuses, and you shoulder blow your nose thoroughly while in the shower.
Ice pack: Many times using an ice pack (bag of frozen peas works great) for 5 – 10 minutes either over the forehead or in back of the head and neck also takes some of the pain away.
Massage: You can give yourself a head and/or neck massage. Use your fingertips to give yourself a “dry shampoo” all throughout your skull. If you find some tender spots, you can use a little ice pack on them, or take a hot shower and follow it up with some ice.
Ranges of motion – always do pure movements in the neck and back. Also do not whip your head in doing these. Never go past a point of pain.
Neck – look up, then down; look to the right, then left; bend your right ear to your right shoulder, then your left ear to your left shoulder. Great exercise to do in the shower.
A brisk walk outside for 5 – 10 minutes may also help you work some muscles, and get the blood moving throughout your body. The fresh air also helps re-energize your body. Along with walking, make sure you take some deep breaths to increase your oxygen intake.