I am experiencing headache (side: front, right) and it's been three days that i have this headache and today it's worse and no other symptomes.

When to see a doctor: A headache can be a symptom of a serious condition, such as a stroke, meningitis or encephalitis. Go to a hospital emergency room or call 911 or your local emergency number if you're experiencing the worst headache of your life, a sudden, severe headache or a headache accompanied by: http://www.mayoclinic.org/symptoms/headache/basics/when-to-see-doctor/sym-20050800