What good news! What a relief.
It is absolutely his right to ask about medications and such. He is right to do so. Health care workers I know say that you SHOULD ask these questions-- you should be informed, check the information, and make sure that the cadre of medical professionals are providing coordinated care.
The stimulation and lack of privacy, on top of fear and pain, must have been a real challenge. Sounds like he handled himself with aplomb. Hope he has a good recovery at home and enjoys some peace and maybe a fun movie or whatever helps you all start to relax.
BTW, speaking from experience, I can say that one can be hypersensitive to noise when in under stress. He's not crazy about that:)
Best to you, your son, and your DD as well.
