Went outside. It's hot outside. Within five minutes I felt really unbearably hot, purple in the face, furiously angry and grumpy.
Lightheaded, eyes bulgy, banging headache and just incredibly hot and angry.
I came home - took my top off and really struggled to get my jeans off as felt so sweaty and weak.
What the FUCK was that. 
I was hungry - I've just eaten now and feel less weird.