Because for decades your title did a lot of quiet work. It told strangers what you were good at, gave your week a shape, put you in a room with people every day and gave you a reason to get dressed. When it goes, all of that leaves at once.
For accomplished women the drop can be sharper. If your work was demanding, public or hard won, it may have become the clearest answer to who you are. That is why the dinner-party question “So, what do you do?” can feel loaded, and why so many answers start with “I used to…”.
None of this means something is wrong with you. It means the role that organized your identity has ended, and the next one has not been built yet. If low mood lasts or deepens, talk with your doctor or a licensed mental health professional alongside any coaching.