I have to chase balls iin?

Everytime I see a ball I have to chase it, it's like my teeth need to sink into something really bad, and I don't know if it's normal. I've been banned from my local football field, the manager of the team says he'll kill me the next time he sees me. I can't play tennis anymore, a few times I've followed the ball and tripped over the net. If anyone starts playing with one in their hands I start drooling. I've also injured my back with urges to chew my testicals.