Postural tachycardia syndrome (PoTS)
Postural tachycardia syndrome (PoTS) is an abnormal increase in heart rate that occurs after sitting up or standing. It typically causes dizziness, fainting and other symptoms.

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Typical symptoms of PoTS include:
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Dizziness or light-headedness
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Fainting
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Heart palpitations
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Shaking and sweating
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Weakness and fatigue
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Headaches
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Poor sleep
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Chest pain
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Feeling sick
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Shortness of breath
Learn more:
http://www.nhs.uk