An 83-year old lady just lost her husband. Her brother visited the lady in her house. He observed that the lady is acting okay but it is obvious that she is depressed. 3weeks after the husband’s death, the lady called her brother crying and was saying that her husband just died. She even said, “I cant even remember him saying he was sick.” When the brother visited the lady, she was observed to be well physically but was irritable and claims to have frequent urination at night and she verbalizes that she can see lots of rats in their kitchen. Based on the manifestations, as a nurse, what will you consider as a diagnosis to this patient?