You're welcome, Snoopy. I hope we were able to help somewhat. Bless his heart, I know he must be depressed with the sudden lifestyle change. He's probably none too keen on having to take meds and go to the doctor all the time, but he's going to have to if he's to beat this - or part of it. I picture him as rather thin. Has he lost a lot of weight recently?
Diseases that affect the immune system are tough to live with - I have one myself, but it's not nearly as serious as your father's, thankfully. All you can do is love him and be supportive. Hang in there, sweetie!

We're here for you if you need to talk.
Hugs,
Kell