Have nightmares for a long time, but also dream of bloody scenes, murders, family deaths and so on. Please help me, thank you.

This shows that there are things that make you anxious in reality, which makes you think too much. In addition to analyzing the causes and possible solutions, you can take a hot bath and soak your feet with hot water before going to bed, which has a good effect of calming the nerves and helping sleep. If you need to interpret dreams, you have to write down the process and details of dreams.