What Causes Dizziness, Shortness Of Breath And Cold Intolerance?

Hi my name is Missy. I am 21 years old, weigh about 220 and about 5ft tall. I have been experiencing jolts of dizziness for a few months and also shortness of breath. Occasionally with the jolts of dizziness I feel a sharp or mild pains in the center top to back of my head. I also have a lot of mucus that has been sitting in my throat for months probably from seasonal allergies, but it is to the poit where it is gagging and I constantly cough and choke along with the shortness of breath. It is to the point where I cannot walk down the hallway of my house from the bedroom to the kitchen and be able to breath at a normal rate. I have tried allergy pills to help get rid of the mucus, but it does not help. Something else I have been experiencing: normally I would appreciate a cool, air-conditioned environment during heat waves, but I cannot stand being in my air-conditioned house. I feel too cold and miserable and would much rather be out in the heat. The heat usually bother s me and obviously makes me uncomfortable and over-heated. But now I feel this way with ac s on. I feel sick and cold (chills), sniffles, shaky, etc. Have any suggestions? Could these symptoms be related?