My cat Sinbad is 10 years old and we've had to recently confine him to the indoors because of a flea problem... thinking it was the right thing to do. He is now showing extremely alarming and erratic behavior. At night he is extra hyper and runs through the house, up and down the stairs. And he is on full alert for the smallest noises now. It's to the point where I've begun to think he is going a little crazy. Should I stay persistant by keeping him inside or just give in and let him out.