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You express your rage. This is what writing exercises are for, to express the unfiltered rage that you have about how these things affect your quality of life, how they make you really feel, never mind how you think you're supposed to feel. This is why we destroy the written exercises, so we can have the freedom to write the unvarnished truth.

The practice of Existential Psychotherapy says that there are four core issues from which you can explore your stressors, especially current ones. They are great topics for expressive writing:
Abandonment/Isolation
Freedom
Meaning
Mortality

Not all four will be relevant to every situation. Financial insecurity, for example, certainly invokes issues of Freedom, perhaps also of Isolation. The death of a loved one will trigger Abandonment and Mortality for sure, and quite possibly Meaning. Whereas being the caretaker for a loved one is likely to trigger all four.

And the big one for so many of us, aging, also embraces all four core issues. So you write about your emotions regarding aging from the point of view of each topic.