By Bret Kenwell Verizon is set for its worst week since October 2008, but it’s sitting on must-hold support right now. Yesterday it was AT&T (T) – Get AT&T Inc. Report; today it’s Verizon (VZ) – Get Verizon Communications Inc. Report. The stocks of the country’s two largest telecom companies are uncharacteristically volatile as they report second-quarter earnings. On Thursday, Verizon shares fell 2.9% in sympathy with AT&T’s earnings selloff. While AT&T beat on earnings expectations, its full-year free cash flow guidance disappointed investors after a trim to $14 billion from $16 billion. This…