Summarize:

B vitamins may help to reduce the effects of stress, which may include preventing headaches. Try taking a daily B-complex multivitamin to see if this helps to reduce the number and intensity of your barometric pressure headaches. Purchase a small barometer that you can install at home. Pay attention to whether the pressure drops or rises suddenly before you develop a headache. Then in the future, take preventative headache medication at the first sign that the pressure is changing quickly.  Check to see if your cell phone has a barometer app. This can alert you if the pressure begins to rise or drop. It's also a good idea to watch the weather predictions for pressure changes. Because dehydration is a common headache trigger and hydration is key in managing a headache, men should drink 15 cups (3,500 ml) of water a day while women should drink 11 cups (2,600 ml). Staying hydrated is especially important if you notice that increased humidity triggers your headaches. Magnesium can help to treat and prevent headaches because it promotes muscle relaxation. If you know the weather will be changing, include magnesium in your diet or take a supplement. Magnesium can block pain receptors in the brain and prevent blood vessels from narrowing in the brain. If you want to supplement, ask your doctor before you begin taking a daily 400 to 500 mg magnesium citrate supplement. To get magnesium from your diet, eat more:  Dark leafy greens Fish Soybeans Avocado Bananas If you've noticed that bright light, glare, or sensitivity to fluorescent lights triggers your headache or makes it worse, pay attention to weather changes. For example, if the weather has been overcast and a bright, sunny day is predicted, be prepared to take medication, stay indoors, or wear sunglasses. Extreme changes in weather can also bring changes to humidity, pressure, and temperature which can affect your headaches.
Take a vitamin B-complex. Buy a barometer to monitor changes in air pressure. Drink more water than usual. Eat magnesium-rich foods. Avoid glare and sudden changes in lighting.