hi I am new here I have 2 cats and am trying to introduce a new one my 2 are 6 & 9 both female, our new cat is 1 1/2 year old male,they are all fixed. I did everything suggested. its not working. been almost 2 weeks. my 6 year old tries to attack under the door she goes attack crazy when she sees him, she couldn't get him, so she went to other end of house and attacked my 9 year old, never done this before they are friends.is there light at the end of this? I'm tired, been sleeping in living room to keep my cat away from door, new cat is in bedroom door doesn't latch good. help