I have suffered from atypical depression for 7 years.
I suffered from brain fog, concentration disorders and memory disorders, and arrhythmia. I've been through them for seven years and experienced a miracle that disappeared in an instant.

I was sobbing and crying at dawn because my situation was so miserable. At that moment, I felt like I was sinking, closing my teeth tightly, twisting my neck, and crying, but at that moment, I felt that the fog in my head disappeared in an instant.

It was real, and I was very surprised. I thought depression was getting better slowly, but it wasn't. I had a distinct pattern of depression. Oversleeping, overeating, sensitivity, anger, etc. As the fog in my head disappeared in an instant, my arrhythmia and concentration memory disorders disappeared. It's a surprise. 

I have never taken medicine for depression. Because I didn't think I was depressed at that time.
I asked others about these miracles, but it is said to be bipolar. But it's definitely not. 
Now, a year and a half later, I live in a healthy state before depression and question this miracle. Can depression be treated all of a sudden?