Suggest Remedy For Excessive Body Heat

Hello Doctor, I am 25 years old and I have excessive body heat. My hands are extremely cold when I am in AC, nails sometimes turn blue when the temperature is too low. At the same time, when am not sitting in AC, say in fan, I feel my body is producing excessive heat and becomes very hot. Sometimes I get rashes and my skin get red color patches and it's itchy as well. What could be the problem? I exercise every alternate day and my food mostly consists of bread, salad and juice.