I am so sorry about all of your experiences so far. It sounds like you have been through so many ups and downs. I'm praying for you and your family. I did want you to know that my daughter nevers runs a fever and she has been treated for pneumonia twice and bronchitis (Alyssa I think you might be right when they say lung infections don't usually produce a fever). Definitey pursue the genetic testing (that's how we finally found out), and always go with your mommy instinct. Ellie has also had to be hospitialized for retracting and low oxygen levels before, it's so scary.
Also, being a proud Texan, I want to apologize and am horrified for your horrible experience in the hospital (alhtough I do not live in Houston). Trust me not all hospitals here are like that. Definitely try to find out who they were and make a complaint, your experience was NOT okay. I hope you find answers soon. I'll be thinking of you and anything you need just let us know.