People are talking about this being how people near death cope with their upcoming death, but it also can apply to people who are going through a major or unexpected life change. Happened to me after I abruptly got married and uprooted my whole life to move to a tiny town and then the world went into lockdown. I started journaling about all of my feelings which were widely varying and then I noticed the pattern. I talked to a therapist about it and she confirmed.