Vampire Academy Dimitri's point (Lost in darkness)

This is a story after The Last Sacrafice from Dimitri's point.
Rose and Dimitri are happy together, but Dimitri got a lot of nightmares about Rose' death. He's getting depressed of the many Strigoi attacks and fights where Rose risks her life and that my think him about the bad things he did when he was a Strigoi. He can't forgive himself for what happend. But he's also really scared about Rose. There's something wrong with her. Did he found out what it is?? Did she survived and did Rose lose Dimitri forever now??