Hello, For a couple years now, i have been very sensitive to the cold (i have always loved the cold, it was always very invigorating for me), and now i cannot tolerate it at all. i shiver uncontrollably with 2pairs of socks, shoes, 2shirts a jumper and a jacket and gloves on! Mosquito bites NEVER heal anymore, and just recently, my body just heats up for no reason at all and i get really weak and shakey. What could it be? I've been tested for all the obvious, like diabetes, hyp(er/o)thyroidism, STDs etc and all clear.