Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with a doctor.
Without the ability to examine and obtain a history, I can not tell you what the exact cause of the symptoms is. However I will try to provide you with some useful information. We do not review referrals or imaging as part of our role on this forum, therefore, my discussion will be limited to the information you have directly provided above.
Double crush injury is a term used to described more than one site of entrapment of a nerve in a limb. The exact nerve affected would depend on the exact distribution of the pain and tingling. In weight lifters, nerve entrapments can occur between different muscles (the nerves in the limbs pass through several structures including muscles and below or above ligaments and can be entrapped there, particularly when the muscles are enlarged, as in weight lifters). Repetitive pressure on the nerve can certainly lead to more permanent injury to the nerve. Sometimes, surgical release is minimally invasive and can help prevent further nerve damage.
Evaluation by a neurologist with specialty in neuromuscular medicine is recommended, as well as evaluation by a sports medicine specialist. An experienced neuromuscular specialist will be able to assess the site and extent of nerve injury and make further recommendations. As you mention, nerve conduction studies are useful in such evaluations.
Thank you for this opportunity to answer your questions, I hope you find the information I have provided useful, good luck.
http://img517.imageshack.us/img517/554/26649042.jpg
http://img52.imageshack.us/img52/9803/80522894.jpg
http://img685.imageshack.us/img685/3836/27070467.jpg
please try these link's lasts one didn't work ta!