Hi! i've had a headache for more than three days. i have been staying hydrated and eating well enough. even doing exercise. ?

Hedaches: 3 days of headache is not normal. You need to get a diagnosis and work up. This could be migraine or something else. It needs a full work up.

Headaches: come in several types, e.g., muscular, vascular, cluster. Stress headaches are unpleasant but fairly common. Please start w/a visit to your doctor to rule out medical conditions. Then consider seeing a clinical psychologist for stress management training such as biofeedback or clinical hypnosis. (See www.asch.net for referrals). Peace and good health. You can do it.