Your concerns are definitely normal, and there isn't much to say other than its a very natural response to your very unfortunate circumstances. It can be very difficult to safely move patients in certain critical health situations to different hospitals, even ignoring the paperwork and liability side of things. I would make sure to keep track of everything they tell you and keep your own record of things if you haven't been doing that, other than that there might not be a whole lot more you can do at the moment other than give support to one another. If he's on antivirals I assume they think he has some type of viral encephalitis like HSVE, which can have long treatment plans.