Since Eli Lilly reported third-quarter earnings on Oct. 30, its shares have had a prolonged sell-off.Since pharmaceutical giant Eli Lilly (LLY 1.35%) reported earnings for the third quarter on Oct. 30, shares have been punished by investors. As of this writing, Lilly's stock price has plunged as much as 14% since Q3 earnings, and it's currently trading 6% lower than it was prior to the report.This precipitous sell-off has placed Lilly stock near its lowest levels in six months. Below, I'll explore what's be ...