PETERSBURG, Va. A Northern Virginia family is desperately searching for their 21-year-old son, who has been missing for two weeks after running away from a Petersburg hospital during a mental health crisis.Aaron Javier Cruz, a senior at Catholic University in Washington, D.C., who grew up in Fairfax, was last seen on Friday, Aug. 14 after fleeing Southside Medical Center in Petersburg. Family members say he had never experienced a mental health …