Im 24 years old and lucky enough only had the stomach virus twice in my life. I am grateful for that but my anxiety levels are up the charts at night. I can never tell if its anxiety or nausea but since I got sick last May with the virus and was in the bathroom at 3am, I have figured out which is real and anxiety. Now it's all back, I can't tell and I am a night owl so I don't think that helps much.