Even as a child, I have this tendency to withstand highly cold temperatures and never felt cold at all(mostly) while others around shiver. But, for the last two weeks, I'm feeling unusually cold, shiver (no signs of fever) and i feel it is abnormal for my body. I had food poisoned recently in the same period of time. I'm worried about this as I am feeling way too cold in an air conditioned room. Please advise. Thanks a ton.