Melatonin memories

Do you ever have random thoughts that just pop into your head and you struggle to leave them in the past? I ended up having a previous trauma pop into my head, it was my first client that completed suicide. He wasn't actually my client but I was a student intern and had taken his crisis call, I called EMS they checked on him and left. I had a nagging feeling and had a licensed therapist who was able to pink sheet him if necessary but after talking to him his wife came home and said she would monitor him. I walked into work the next day and my supervisor notified me that the young man I worked with mother called and told them he had passed away, I had someone completely different in my mind and she clarified it was the person I had dealt with in crisis. He had asphyxiated in his sleep due to alcohol and melatonin. I pushed for him to get help but no one took it seriously enough, and I still regret 10 + years later I didn't go with my gut and push harder to get him help. it's funny how traumas from years ago come back into your memories like it was yesterday. I recently started taking melatonin due to sleep, and felt the grief all over again. simple little things can trigger big memories and we don't always know how to process them but I do know from that day forward I've gone with my gut reaction to try to save the next person.