The Mets are hurting — literally and otherwise — after a 4-0 road loss to the Astros completed a Houston sweep on the same day John Maine went on the DL and Billy Wagner was set for an MRI exam. Ouch. As a result of all that coupled with Philadelphia’s win at St. Louis, the Mets dropped even deeper into third place in the NL East. In sidebar to those two developments, the Mets say they aren’t worried by reliever Duaner Sanchez’s recent arm weakness.