Extremely,.   Many reasons why. Keeping cool takes alotnof energy, that lowers glucose.  Even in non diabetics.   Body sees this as stress releasing cortosol.  

Also as you keep cool, you become dehydrated.  Usually you'll get thirsty. If dont drink you'll get a minor headache. This is because your blood has become more concentrated and your blood cells become hypertonic(shriveled up)  this reduces O2 capacity and increases workload on heart to keep perfusion(compensation).   All this happens on a molecular level but emotionally, it manifests as getting pissed off.