Lose the poly.
Many come back hitting too hard to soon.
Many have posted here that using the Thereband Flexbar to help build up their forearm muscles helps prevents an early recurrence.
Tennis Elbow: Step-By-Step Instructions For Treating Elbow Pain Using Thereband Flexbar.
Thera-Band Flexbar Hand Exerciser - Tennis Elbow Relief Bar http://www.amazon.com/TheraBand-Y0A2.../dp/B00067E4YU
After the pain is gone, make your first hitting sessions short and gradually lengthen them.
Players who continue to play with pain can see their tendons suffer permanent changes into just strands of scar tissue - a process known as tendonosis: