You can label this any number of things but the truth is that no one really knows what causes it or why. Many doctors love labels: where they can say "ok it's this and this, and here's the best solution." Reality is not so simple
Isolating or spending too much time alone can make it "worse" ime. Go outside. Dont take them too seriously. Perhaps this sort of thing happens as a reminder of our historical evolution. The past haunts the present, both in short and longer term iterations. Also, it is likely a consequence of and neccesary to higher rational thinking. So it cant just be "deleted" imho by anti-psych meds without suffering an equivalent loss
Whatever you do, dont assume that what they are telling you, especially if it is a command, is the right thing to do. Some people have this sort of thing hapening daily 24/7 and it can come on suddenly. Dont be afraid of it either. It is an emotionally charged phenomenae that occurs bidirectionally ie it appears possible to interact with and influence the dialogue which is occurring in realtime from a logical standpoint.
Fear begets fear. Love and acceptance is key