Depression is an illness that can sometimes cast a dark shadow over our memories. Depending on your mood you may not be able to come up with a good memory. Or, depending on your mood, you may not be able to recall anything good about a happy memory. Depression can do that to your memories.
Diagnosis may not be as complicated as you imagine.
Do you remember when you first realized you had some symptoms of depression?
Here was my initial experience.
I was going through a stressful time in my life (divorce), but coping, or so I thought. One of the ways I dealt with stress was through exercise, particular, walking. One day, while on my walk, I felt like I could not go at my usual pace. The only other time I remembered feeling that awful was when I had anemia. So, assuming that it was the same thing this time, I went to my doctor.