Basically, ive had this cartilage piercing for 2 and a half weeks now and it still hurts to sleep on, touch, and twist, when I clean it after it turns red and stings :S , is this normal ?

You shouldn't need to turn it (oldest myth in the book 3 piercers have told me now, wish they told me that sooner! Heh) It will stay sore for some time, If it starts to swell or hurts when its untouched is when you need to worry, if you are really concerned call your piercer, all the ones I've known have been fantastic about follow up questions. :)