With family and a lot of people are sick

At my cousin's house during break and a lot of family are here. Turns out a few people are "recovering" from the flu (actively coughing) and there's a few people that are definitely still fully sick with the flu. I am so stressed about getting sick. I keep going to wash my hands and face in the bathroom every so often because I'll get so dizzy thinking about the fact that I am definitely breathing in the flu. The worst is the fact that it's maybe the third instance I've spent time w/ my cousin's little kids and I really like them - but I know that they've been all over the sick people and now I'm super paranoid to let them touch me - even though I really want to be affectionate with them and get to spend time w/ them. I don't know how to calm down about this. I'm super prone to psychogenically giving myself symptoms - I've been here less than a day and I think I feel a sore throat developing. Ughhhhgghhhhhhghhhhhh....