To answer the first part of your post, it isn't this simple. You may well have assumed you would get better, but if we take predictive processing, the key issue is whether your brain determined you were safe or not. Multiple factors can potentially play into that decsion. Subconscious danger isn't a 'damaging idea,' it's how the brain works. We are bombarded by a huge amount of information daily - that can range from tv adverts, newspaper articles, things people share online, conversations, cars in the distance, bikes, dogs on walks, things that will relate to past (bad and good) memories.