There was an episode in Star Trek The Next Generation where after a failed experiment things got weird for doctor
Beverly Crusher; she would have a conversation with someone, look out the window and when she looked back in not only had the person vanished but so too was any evidence they ever existed both in the memories of others and in the ship’s records.
Soon everyone aboard started being erased from past and present until in the end Beverly got left alone. When she suspected something was wrong with reality she asked the computer how big the universe was and the reply came that it was about the size of the deck she was on.
And it kept shrinking.
There are nights when I feel exactly the same