I would definitely try to speak with the head resident at the hospital, and also ask the different nurses what their experience has been. When my daughter was hospitalized with RSV as a newborn, I found the nurses to be the most informed and helpful, to be honest. They spend the most time with patients, and generally become familiar with the processes. Just keep asking until you get one or two who are familiar with this illness -- in a hospital you most likely will.
I know how stressful it is to have a child in the hospital for an extended stay. Sending you lots of hugs and strength to make it through. Always remember that you are your child's best advocate, and never be afraid to question the doctors or nurses, and ask as many questions as you can. If you at ALL feel that something is not right, push until you get answers. No need to be mean, but firm is good. I found that the more I asked questions and demanded answers, the better care my baby rec'd.
Hope your son's stay is brief, and you are all home together again soon. And I hope you find answers soon.