Sports watching is stressful

I used to love watching sports. The Oilers, Rockets, Astros, I loved all the home teams. Something happened during the Rockets three years on top. Maybe I became too emotionally involved, because now I no longer find watching sports enjoyable. Last night I turned on the tv to watch the final innings of the Astros and Cardinals and was able to watch 2 minutes. I got nervous and started reading a magazine to keep myself distracted. It's just a game! It's supposed to be entertaining and a stress reducer, not a stress inducer.