I have a terrible headache.what i do?

Terrible headache: Sorry, for how long you had it, is the entire head, or is localized in: the; frontal, occipital, lateral on the L or R territories, is it affecting the vision, when you started getting these headaches? IF is very bad, you should go to the ER, They will do an MRI, and put in touch with a neurologist. Do not initiate any medication on your own, ask someone to take you, you should not drive Sorry

Nonspecific: You could try an OTC NSAID type of product, but clearly, there may be causation to be uncovered, and prefer you notify your doctor. You do not indicate whether headaches are prior issues, but I would wonder if you might benefit from visit to neurologist.

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

Fluids/ibuprofen: Keep up on your fluids, take some ibuprofen (or other anti-inflammatory) and if it continues or gets worse I'd see my local MD. No worries

Response: Your headache might be caused by migraine, but I cannot exclude other intracranial causes. Contact your physician, and discuss. Although unlikely that you have intracranial bleeding or infection, a sudden severe headache in absence of prior such events indicates a need for medial attention.