Can you getTennis elbow from throwing cards?

I am a tennis player and have been for quite some time, I have never experienced any sort of pain in my elbow before. Then I got into throwing playing cards. In one day I had practiced for about 2 hours straight. I had to take a break when my elbow started hurting and it was painful to bend. Is it possible that I have developed tennis elbow from throwing playing cards? How can I treat this while still being able to throw cards?