woah. Did they give you any possibilities as to what it could have been?? I am so glad he's all right. I can totally relate to the paranoia because I am quite paranoid. Even hearing this makes me nervous about my babies. So I don't have any advice on how to get rid of it. Sorry.
OMg hon how scary! Thank God for looking out for little Bruiser! I pray this was a one time thing and he'll be alright. My gosh that must have been so scary, so sorry you had to go through something like that!