Here is a link that will describe the most common causes of elbow pain: Elbow Pain
If it does turn out to be tennis elbow, what I've personally found most effective is to wear a tennis elbow brace on my forearm, just below my elbow. It sounds weird, but it works really well. The brace on the forearm protects the elbow from being strained when you use your arm. It usually takes two or three weeks to heal with the brace. Without it, I'm not sure it would ever heal because everytime I use my arm, it strains the elbow a little more. Here are links to a couple of different styles of tennis elbow braces so you can see what they look like and how to wear them:
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