Hi, this has happened to me within the past 10 years, and it only happens during seasons with cold weather.
When I get hot, or nervous, or anxious, where normal people are described as breaking out in a sweat, I get excrutiating pain all over my body. It feels like i am being stabbed by millions of needles, I itch, and my skin turns bright red. Once I actually start sweating, and there is actual persperation, the pain goes away.