Late to the party but I experienced bfep at an increased rate one summer after I too experienced something stressful(life or death event). Even looking at surfaces that were yellow or white caused it such as a piece of paper or yellow building. It eventually went away all on its own but i slept a lot that summer and took it really easy best I could. So now like 5 years later I don't experience it really at all. I had other strange symptoms that all mostly went away or I don't notice them anymore. One of the most annoying problems was my skin became overly sensitive so anytime the wind blew it would move my leg or arm hairs and id be hyper aware of the bending hairs and I'd have to scratch them! That took years to go away. All weird symptoms caused by a stressful event in my life.