She's sitting by the window screaming and hissing at something outside. freaking out the dog, her kitten and me. so i took them and myself to my room and shut the door and left her to roam the house but lately she's been acting distant. I know i sound stupid but I'm really nervous, i don't know if she's just angry or its some side affect of some illness. Please help. Ps- she's up to date with all her shots the only thing is she is an outdoor cat but those noises weren't the ones of when she wants to be outside - they were scary, aggresive and a little depressing.