My cat left the house for an outing perfectly fine, and when he returned he seemed really jumpy or scared. He started running around crazily back and forth, I opened the loungeroom door and he raced in and ran to my sisters room and hid in her draws. After a while I went and checked on him and he jumped down from her draws and ran into my room and hid under my bed. His never like this, he hasn't hid under my bed for years now. I'm quite worried about him. I can see he has a little injury on his head, but he always fights with the other cat in our street, and seems to turn out fine but this is the first time his been acting like this.