My cat, Tigger, is acting very strange. She is usually friendly and happy. One day she went outside and when she cam back she was okay. The next day she went to eat at her food bowl when suddenly she ran to the fish tank, yowling and acting spooked. She then ran upstairs to hide under my bed. Today she is hiding in a corner and won't come out. She seems scared and I gave her some cat treats and she ate them. Can anyone help me help my precious kitty become her normal self again?