every time i work out really hard and sweat a lot, after i cool down and shower and get dressed, i am cold for the rest of the day. very cold. like in the summer i am wearing jackets and sweaaters. it is very annoying, as i am sensitive to the cold anyway. i have had some people tell me that it is from dehydration. UNPOSSIBLE i say because i drink plenty of water daily. does anyone know what could be causing this?