Sick Interested in information and stories about URI?s

Hello, I have a Piggy that I think is coming down with what I think could be a URI. I?ve never expirenced a sick pig in my time that I?ve had them. I can hear her breathe and she is pretty lethargic. She has no crusty eyes or nose. I noticed she wasn?t herself Saturday. If it is a URI, I hope I caught it in time. If it is to be a URI.. where in the world did it come from. Now new animals or other people?s animals in my house. I?ve had 2 for a year and I?ve had the other 2 since October who are also a year old (I got them from my nephew). My husband and I have not been sick. I do have a 12 year old bunny that is not sick. Even though I know they can carry that bacteria, they aren?t housed together let alone have ever touched noses or anything like that. Their food is totally kept separated in bins with lids, their cage is a huge C&C so it gets air ciculation.. not to mention I?m very good about hand washing. It?s just so odd to me to all of a sudden have this. My sweet girl is going to the vet today at 3:20 and I know I will have some questions answered. I just wanted to ask for advice for my own peace of mind to get through the next few hours until she goes. I just can?t bare thinking I did something wrong and I also have 3 other girls. Thank you in advance for any help or good stories. Also if it happens not to be a URI than thank god.. but that means that it?s something else.