Migraines.... I hate them...
Description of what effects me:
Visual disturbances: About a third of migraine sufferers experience migraine with aura, a condition in which the migraine headache is preceded by visual disturbances, including the appearance of flashing lights, blind spots, or "snowy" vision. The aura may also manifest itself as tingling or numbing sensations in the skin or in the form of auditory disturbances.