During stressful times of my life, I do keep a journal. I use them to be able to handle my feelings. I kept a journal while my sister Zoe was terminally ill. It was a time of conflicting feelings. Writing helped me to at least get my feeling on paper. There were many nights that I was able to sleep only after writing in my journal.
I keep all of my journals. Sometimes I do go back and read them, especially if things are rough. I am not keeping a journal right now, but I probably will if I find myself under stress again. I don’t think I would ever destroy them. They are not something that you write intending for other people to read. If my son reads them after I pass away, he may find them to be of value or they may be junk. I will leave that to him to handle in the future.
I handwrite my journals in pen (gel pen is easier when one has arthritis in their hands) and just use small size spiral-bound notebooks. They aren’t pretty, but they help me get through the days and weeks.