About 3 months ago I had the same thing happen to me. It was very weird because I like the cool air. So I took a chair outside and sat in the sun for about 30 minutes. The whole time I sat there I did not even break a sweat and I was still cold.

I did mention this to my doctors and they came to the conclusion that it could be a lesion in the area of the brain that controls temp. Same thing that lady express said. The new symptom lasted for about 2 weeks for me. Now its gone, and Im back to not being able to tolerate any heat.