My sister keeps acting moody & its annoying me. What to do to calm down?

what you have just done is probably the best thing you can do, also try keeping a journal, then read it the next day and you will probably find that the problem may not be your sister but you. you keep talking about your calm and your haze , your sister knows how to push your ons , try talking to her at a time when there is no confusion, i have twin 16 year old daughters same problem its called growing up . if that doesn't work you can always vent again. good luck / (:>))