Hi there! How long ago was your uncle sick? I believe sv particles only stay alive for 48 hours or less. Also, you're probably feeling sick because of your anxiety. It happens to me all the time. If I'm up with anxiety all night, I'm bond to feel gross in the morning. I would say you have a VERY slim chance of catching something. It sounds like he has a belly issue that isn't contagious. I hope you're feeling better now.