Though future is not present

On the other hand my father often thinks of future, which makes him anxious. Asked about how he was by nurses who take care of him he never fails to complain of a chest pain he feels at dawn. Then he asks me what and how he should do if something urgent occurs to him when is alone at night. Honestly speaking I myself do not know what I can do because my experience of cardiac infarction taught me that even waking the family living together was difficult once the intense pain began. Anyway what I want to say is that the patient who suffers from dementia cannot be free from the anxiety which belongs essentially to future.