@danab, I nonintentionally began my 'diary' when I was keeping a list of my medical expenses. However, it gradually turned into a schedule for my appointments and procedures. It was not until I was housebound that I began a journal as a way to fight boredom and to look for/record anything positive for my focus. I found that after my transplant, I could use my records in patient portal to fill in some gaps.
You might find some helpful information by reviewing your patient portal, and old insurance payments and medical bills.