Mayra StorySH_2015_YEAPGiving_EBlast1_Piece3Every Friday morning, Mayra Cruz Rivera swallows seven pills of methotrexate at once.  The chemotherapy drugs immediately leave a hard metallic taste in her mouth, and her body doesn’t like them — she throws up a lot, and she’s been having seizures.  It takes all the effort she can muster to manager lupus, a devastating autoimmune disease,