A wave of blood goes up to my head, my stomach shrinks...

A wave of blood goes up to my head, my stomach shrinks together, as if something dangerous has just missed hitting me. It's as if I've been caught stealing, or telling a lie; or as if I've heard other people talking about me, saying bad things about me, behind my back. There's the same flush of shame, of guilt and terror, and of cold disgust with myself. But I don't know where these feelings have come from, what I've done.