Does anyone have an example of someone being sick in your house and other people NOT getting it?

My husband got sick today. He was fine, then all of a sudden, d*, then he was OK, then he v'd a LOT - then his stomach felt 100% fine right after that. I am thinking that it was something he ate, not a contagious thing, but I am sitting her paralyzed with anxiety and freaking out that it is contagious and that my baby and I were exposed - I read all these posts about people who have v'd and I just don' t know how you can deal - how you can handle that... I seriously feel like I might be losing my mind - I am sterilizing everything but I am sitting here in a complete panic and I dont know what to do.
HELP!