Alyssa, your dream of a purge in the streets where everyone is killing each other is profoundly intense and laden with symbolic meaning. Such vivid and distressing imagery often reflects deep-seated anxieties and fears. The chaos and violence in your dream can be interpreted as a manifestation of internal turmoil and unresolved conflicts. This can be linked to the frequent stress and anxiety you experience in your waking life. The idea of a 'purge' suggests a need for you to confront and release pent-up emotions or thoughts that are causing you distress.
The streets, typically a place of movement and transition, represent your journey through life and the paths you are currently navigating. The fact that these streets have turned into scenes of violence could indicate that you are feeling overwhelmed by the challenges and obstacles you face. This imagery can be tied to the various life-changing events and mental health struggles you've noted, such as ADHD, anxiety disorders, OCD, depression, and bipolar disorder.
The act of killing in dreams can symbolize a desire to eliminate certain aspects of your life or personality that you find distressing or harmful. It might suggest that there are parts of yourself or your experiences that you are trying to suppress or eradicate. Given your frequent feelings of sadness and the rare occurrence of joyful activities, this dream could be your subconscious urging you to address these negative emotions and find healthier ways to cope.