Stress Center Peer Support

I will occasionally have sort of flashbacks to a stressful confrontational that happened in the past. For example, I will relive (or experience) a situation when a co-worker yelled at me, or another confrontational situation. Sometimes I will wake up at night and these previous events will pop into my head. These thoughts just come into my head - seemingly out of nowhere. Was wondering of others experience this? Would it be appropriate to call it "trauma"?

I too wake up out of a sleep in the middle of disturbing thoughts, as if I were never sleeping. They are either about my job, that I hate or my mother who is ill. I'm not sure but maybe the subconscious mind doesn't let go of these thoughts. I would love to empty out my subconscious. There's nothing in there but sad stuff. Don't don't if it's trauma but definitely things that really bother us.