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What you describe can be called POTS, or Postural Tachycardia Syndrome.
This is nothing to worry about, however if this is a persistent issue then you should get someone to examine you and check for this.
Adrenaline can be involved yes.
It is also possible that poor sleep would contribute to a faster heart rate as well.
If blood pools this causes varicose veins, you would not feel it. So I am not sure what you perceive but I would suggest getting someone to examine you at least.
Yes, I would, your GP would be a good place to start.