I keep hearing a sound, like a phone vibrating, but there's no phone going off. It happens randomly. Sometimes when I'm with people and sometimes when I'm alone, but either way there's no phone going off. I always hear it like it's right behind me, but every time I look there's nothing that could have possibly made a sound like that. I'm really confused... And kind of worried... What does it mean?!
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That is one symptom of a B vitamin deficiency. Get B-100. Nutritional yeast powder is even better.