I had flashbacks about my past up until I was twelve. They were very random like me at four crossing the road but left the small plastic stool in the middle of the road when we were preparing to move out. It was yellow and has different colored legs. My sister was playing in the background, I was running to her. It gets more vivid when I look through red or blue tinted objects. Another clearer one is once I looked out the car window when I six, it was raining and I could see tiny rainbows in the droplets on the screen. Also when I was two, I broke my navy blue plastic spoon during lunch.. I was sitting on a round wooden table with twenty or so kids in a nursery.

It wasn't bad and doesn't obstruct my work, but you had a trauma before so I think it's better for you to mention that to your doctor like what @IceCreamKid suggested. You'll be fine. ^^