If it is bothering you then you are experiencing trauma. There is treatment, and it will help. The sooner you go, the easier it is to overcome the trauma. Our brains don't know how to process things that are too far outside of our normal expected/acceptable experience. So these things don't get filed properly because our brains don't know how to make sense of it or what to do with it. Those memories keep jumping out when anything reminds us of them, because those things don't fit anywhere. There are some very helpful therapeutic techniques to help your brain to accept and make sense of those experiences and to file them like we do our normal memories so they don't keep jumping out at you and the flashbacks will stop. There might be counseling available through the fire department to help firefighters who have something like this happen to them. It is a normal reaction to an abnormal experience, and you can be sure that you are not the only one who has symptoms like this. But even so, it probably won't go away by itself. You need to talk to someone.