This dream you experienced is rich in symbolism and could reflect a variety of emotions and situations in your waking life. Here are some interpretations that may resonate with you:

1. Feelings of Isolation and Vulnerability: Being in a large hotel/casino and getting separated from your friends might symbolize feelings of being lost or alone in a situation in your life. The hotel could represent a temporary phase or a place of transition, suggesting that you may feel trapped or confused about your current circumstances.
2. Fear of Losing Control: The repeated attempts to navigate the elevators could indicate a struggle to regain control over a situation. Elevators often symbolize the ups and downs of life, and your inability to remember the location of your room may reflect uncertainty or anxiety about your direction in life.
3. Encounter with a Threat: The encounter with the chubby guy who stops the elevator and later assaults you could represent a fear or anxiety about vulnerability and being overpowered. This might relate to personal experiences of feeling threatened or unsafe, whether in a physical, emotional, or social context.
4. Lack of Support: The lack of urgency from the people who come to help you in the dream might reflect feelings of not being supported or heard in your waking life. This could point to a fear that others might not take your struggles seriously.
5. Connection to Loss and Support: Calling your mom and the mention of your deceased dad could imply a longing for comfort and guidance during difficult times. Your dad’s presence in another casino may symbolize the search for stability and reassurance in moments of distress.
6. Emotional Release: The intense emotions of crying and screaming might suggest a need to express and process feelings that you might be holding back in your waking life. This dream may be encouraging you to confront these emotions and seek the support you need.

Overall, this dream could be urging you to reflect on your current emotional state and any feelings of being overwhelmed or unsupported. It may be beneficial to reach out to friends or family for support and to address any underlying anxieties that may be troubling you.