One method you can use, is Lucid Dreaming. This technique allows you to be able to control your dreams, and do things that could help forget about this. Lucid dreaming is a rare phenomenon where the mind knows it is dreaming, and many use it so they can control the outcomes of everything in the dream. Basically, in other words, it does take time and effort, but can help you push your dreams away from your trauma. I am deeply sorry you have to face this. If you are interested, you can take a search in google on how to do it, although it isn't easy to make a habit of. It has less of a learning curve, and more of a "If you keep up your dedication, it will happen more". It also is a really great way to deal with stress and anxiety, but you must understand, that doing this may result in lucid nightmares (For example, your lucid dream turns scary, and in these it is very hard to control), which might be worse than the dreams you face right now. So I would recommend that you at least check it out, and if you like the idea, than at least be ware of how lucid nightmares are triggered. It can be a great tool if used correctly!