Get quick pain relief by wrapping a cloth or towel around an ice pack. Hold the wrapped pack over the part of your head that's throbbing or aching. Keep the pack on your head for 20 minutes. Reapply the ice pack throughout the day if your headache returns. Some people find that relaxing in warm water can relieve the pain of a barometric pressure headache. If you prefer, use hot water since the steam may help open your sinuses. Soak or shower for as long as it's comfortable. Let yourself relax and breathe in slowly through your nose. Once you've taken as big of a breath as you can, slowly and evenly release the breath through your nose. Repeat this or your favorite relaxation technique to manage the pain of your headache. Other relaxation techniques include:  Massage Yoga Tai chi Walking or swimming  Meditation or guided imagery

Summary:
Apply an ice pack to your head or neck. Take a warm bath or shower. Practice deep breathing or relaxation techniques.