She drives me insane!!!?

My sister has got to be the strangest person on this planet. She's older than me and our ages are quite close but we don't get along AT ALL. When she feels like hugging me etc...it literally hurts! For instance, she'll hug me and basicallly choke me at the same time (unintentionally but still!) and when I push her away all she can manage to say is 'piss off, psycho bleep'...that is just one tiny instance (it just happened) but she gets into fights with me about absolutely EVERYTHING.

I know I show her quite a bit of attitude but she doesn't try to rectify situations either, so I end up giving up and back chatting...

How the hell do you control your anger and shut your mouth when you have a delusional maniac living with you??

There is literally not one day where we don't fight, i'm getting really exhausted over the constant arguments these days...