Have you talked to your T about this? I'm curious what they'd think. I wonder if this isn't a sign of a repressed memory having to do with NYE. It sounds like PTSD symptoms, and with it having to do with that day specifically it also sounds like a repressed memory. Repressed trauma memories sometimes show up as irrational fears of things. Apparently if you were abused at a very young age it is common to deny it cognitively because you need to rely on those same adults to care for you. But, let me big disclaimer this that I'm not a therapist so I'm just talking out my *****. But I do think this would be a good topic in therapy for sure.