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1. It happened a year ago, right after a brief flu episode.
2. No history of chronic disease
3. No medications
4. Seems to get worse when i'm in a place with loud noise, like a noisy mall or restaraunt, after exercising, after a prolonged period of concentration such as reading or watching a movie.
Usually, sleep or completely avoiding any type of external stimuli relieves the symptoms until the next episode.