Epilepsy is a central nervous system (neurological) disorder in which brain activity becomes abnormal, causing seizures or periods of unusual behavior, sensations, and sometimes loss of awareness.
Brain Stroke or attack causes sudden onset weakness/paralysis of a part of body. It is equivalent of heart attack. In brain attack symptoms depend on which part of brain is affected.
A headache can be a sign of stress or emotional distress, or it can result from a medical disorder, such as migraine or high blood pressure, anxiety, or depression