Hello. I am a 16 year old male weighing approximately 255 pounds, as well as being about 5'7. On July 1st, at approximately 11:30 p.m. I experienced a cold sensation starting in the center of my chest and spreading through my whole chest area suddenly, then disappearing. I am constantly in a minor state of dehydration from not drinking a a lot or water daily. I typically stay in home all day. I've only felt this once so far and am not sure if I should be concerned or not. Any information is greatly appreciated. I was diagnosed with Mild Depressive Disorder about 3 or 4 years ago, if that is of any help. Could somebody please tell me what this cold sensation might be? Thank you very much in advance.