You can always change your privacy settings on your journal. You can make your entries "friends only" (people on your friends list) or "Just for you" (so only you can read them) so then you won't have to worry about people snooping in your journal.
That's hard that your brother won't be around for a while, but at least he's safe and that's what matters. Spring break may be dull, but at least you get a break from school. That can be nice...