I think its just your brain trying to trick you, because its a poweful thing. When it hears noises it recalls situations that the noise is linked with.. Like a girl screaming to a TV series where there was violence involved.
But anyway, it takes the noise that you hear, like wind the wind shutting a window, and makes you feel like you are in the situation that it is connected too. You just have to take control and make sure you see that its only mind games, and probably because you are bored.
If you got out, or even tried to do things that were mentally challenging, like reading or crosswords and puzzles, then you'd be too occupied to notice anything.
Its more than likely that you are thinking about moving to Uni subconsciously, and you are scared, like anyone would be. So you are attempting to convince yourself that you can not do it, when you can. Just try some of the suggestions, and take control of your mind, dont let it control you.
Amy, x