Using emotions in writing is one of the things that came up in the memoir writing class I recently took. I tried hard to remember exactly how I'd felt during each of the times I recalled in what I had already written before taking the class. Some things I can recall, but not others.
I did follow some of the things listed above when working on my story, such as using memories, since that is what a memoir is all about. I also found some old journals I'd kept years ago that tell about the original time I was on antidepressants. Since journals are generally kept brief, some of that I'd said then seemed a bit out of context, so I tried to make it sound as clear as I could make it.
I still want to try some more free writing. I should be doing more of this, since it's one of the best ways to get your creative juices flowing!
As I continue to work on the memoir, I have been trying to find ways to express how I recall feeling at the time.