Uncontrollable Shaking During SmartXide DOT Laser

I had SmartXide DOT Laser for acne scars. It was painful, but bearable. I started shaking half way through. My skin just felt like it had been burned, but before I left, I felt fine. I didn't bother with cold packs. What would cause the uncontrollable shaking? I wasn't cold nor afraid.

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