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It all depends on the wavelength and power of the laser.
The usual hand held lasers that are used in pointers and pistol/rifle aiming systems will not cause any damage to you at all.
Optical scattering is something you see, not feel. Hypothermia is not caused by a laser but rather by being exposed to the cold. For hypothermia you would move to a warm place.
I'm glad that covering you head with a dark hat makes you feel better.
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Dr. Rick MD FACS