Hey hun, just catching up with your diary.
Sorry your sis was so hurtful and thoughtless. As others have said, she wanted to show off in front of someone she fancies and didn't want him to think she was being 'looked after' by older sis. When it's a bit less raw, you might want to mention how hurtful it was.
How are the nightmares? I used to have lots of them myself so I know how you must be feeling; mine have tapered off thank god but I still get them from time to time if I'm under stress. Lots of deep breaths and resist the temptation to switch the light on when you wake up - I was told it reinforces a message to your subconscious that there's something to be afraid of.
(((hugs)))