JD - have your character be faithful in the end. We don't need another Michael Schiavo killing off his wife. You will NOT find a sympathetic audience.
Rachel, I'm "sort of" writing a book. I'm basing it on my actual life. What I do is, when I remember a certain event, I rush to the computer and write it up. Just fast, sloppy, unedited writing, so I don't miss any of the details. Eventually, I'll get it all together in chronological order and then fictionalize it. I'm sure it will be more than one book. If it turns out to be pleasant, I'll release it in the next couple of years. If not, I'll wait to release it after both of my parents are dead.
I find bouncing memories off my little brother is helping me to remember all kinds of things I'd forgotten. Stuff too good to lose.
St. Ann