Tingling in arm (serious)

[Yeti]

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Last night I was lying on the floor playing some PS2 for an hour or so, resting on my left arm. Afterwards and all through today I have a tingling all down my arm, most notable in the middle and on the palm of my hand.

It shows no sign of subsiding. What to do?

What's weird is I'm usually lying like this on the laptop on my right arm for many hours a day and have never experienced anything like this before.