Hi Jessica!!

I hope you're feeling better now! I think you're having pure anxiety. When you say you feel a 'sense of doom' that is a tell-tale sign of anxiety =)

Just take a few deep breaths and you're going to be just fine. The last time I had Noro, it was quick. There wasn't much time in between the time I started feeling gross to the time I knew I was definitely sick. (like two hours) You can't sleep because you're anxiety is so high. Can you take a warm bath and maybe turn on some relaxing music?