Oh Tom, it sounds like your poor son has been so neglected not only in his own home but then in foster care as well. It almost seems like there wasn't much of a difference between the two. They both failed in providing him with the proper medical care.
I can certainly see now why they want him in hospital and I have to agree. My oldest daughters first hospital stay was just a couple of weeks after she was diagnosed. She was 3 yrs old. (history: she was diagnosed just one week before our second daughter was born). They admitted her for tests and so she could get used to the hospital environment.
With time your son will learn how to do a pft. They can work wonders on children, teaching them how to do what they need to do. Being at a children's hospital I have every confidence that he will now get excellent attention. Child life has been wonderful at every hospital we have been to. They will teach your son through play about all the different things that are happening. I can remember my daughter making a doll so that she could practice CPT with, they taped a bandage to her arm with an attached line, gave her a needleless syringe and a neb. with mask. So her doll could do everything she was having to do. It had a little hospital gown and everything. I know you have a son but a boy doll is good too.
The nurses are also usually really great. You may encounter one or two that's not so great, we have, but for the most part they are. Here's one thing I always did and still do and you can see how old my girls are now. I bring in their own blanket or comforter and their own pillow. I also would request an egg crate topper to be put on their beds to make it softer. The one time they didn't have them I went out and bought one of those lesser expensive memory foam toppers the 1" size, in the twin or twin XL size. Take it home and bring it in the next time. Our hospital only has VCR's, (they are slowly upgrading) and I purchase old VHS movies at garage sales only for the hospital. How is your son's activity level? Keep this in mind for later if you need to, I mentioned bringing in our daughter's bike and putting it on a trainer, she'd peddle away while playing nintendo. That was when the doctor came in and said "get her out of here, she's not sick". That was on day 7. But if he likes his bike that's an idea to do. Anything to keep him moving because they don't get much exercise in the hospital.
I tend to rattle on, Sorry. Keep us posted on how he's doing. He's so lucky to have you now!