I've had tennis elbow, and for me it does not come on so suddenly. I had some smaller warning pains which I ignored. Can you go see an orthopedist? I don't think primary care docs can help as much as an orthopedist. Icing it may help, it does for me. The physical therapist says to fill dixie cups with water and freeze them, and the peel away the top and rub in a circular motion until the affected area is numb.