How can I warm up?

I was at my tennis practice today and I unfortunately grabbed a pair of shorts and a short sleeve tshirt. It was less than 40 degrees with some breeze and cloudy skies. I played for two hours. My body was completely numb and my ears hurt from the cold. The wind kicked up towards the end and I felt like I was going to die I was so cold. (If you were wondering... I totally won both matches I played) now I'm home, two hours after practice and I'm shaking from how cold I still am. I already had a mild cold and sore throat. I just can't stop shivering. My body temp is fine and I'm in a sweatshirt and pajama pants, but it still doesn't seem to be warming me up. I hate shivering for so long! I had warm food to see if it would help, but it didn't. I'm still shivering badly. How do I get warm?
How can I warm up?
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