right elbow pain and bat vs. punch

[coolstv88]

I have returned to hitting for 2009, and havebeen experinceinggreat succes, love the structure you get from the adress possition using impact fix.

I have however after three days of long practice sessions begun to experince quite a bit of pain in my right elbow. I know that this means I am swinging with my right arm with the elbow replacing the left shoulder as the swing center. Are there any commen pitfalls that may be causing this to happen

I am currently not sure if I should be using bat vs punch basic major stroke. I I have been using bat, and messing with punch. Is there any definable advantages to either, bat seems more structured, and also seems to have more defense against right arm swinging.