This dream may represent feelings of betrayal and fear in your waking life. The building with hundreds of rooms and red doors could symbolize the complexity and confusion of your emotions. The fact that you had to search for the person who blocked you on Snapchat suggests that you may feel lost or disconnected from this person. The act of being tied up and experiencing crazy events could represent a sense of powerlessness or being overwhelmed in a situation. The presence of cameras and friends laughing could symbolize a fear of being judged or humiliated by others. The knife and the hurtful words spoken before your throat was slit could represent a fear of being physically or emotionally harmed by someone close to you. This dream may be reflecting your subconscious fears and anxieties about a relationship or situation in your waking life. It may be helpful to explore these feelings and address any underlying issues in order to find peace and resolution.