buchanan

So I bought this pitiful looking guinea pig the other day from this awful pet store because he looked like he had been through the ringer.So I get him home and he wants to visit with my other pig and so he jumps right in the cage. Well if I'd have known how seriously sick he was then I would have never exposed him to my other one. Well last night I was up all night with him because he was sick so I took him to the vet today and come to find out he has a serious respiratory infection(that my other one could now have) and he had been bit by a dog or cat. Now I am freaking out that I might lose one if not both and I feel like the worst person in the world when all I wanted to do was help out a poor sick little creature. Any advice to cheer me up