Dreams involving violence and intense situations, such as the one you described, can often reflect inner turmoil, stress, or feelings of powerlessness in waking life. Here are some potential interpretations of your dream:

1. Conflict and Struggle: The dream may represent a conflict you are experiencing, either internally or externally. The violence could symbolize a struggle against obstacles or challenges you feel are overwhelming.
2. Feeling Overpowered: The act of being mugged and later attacked could indicate feelings of vulnerability or being overpowered in your life. This might relate to a situation where you feel you lack control or are being forced into a corner.
3. Pain and Suffering: The physical pain you experienced in the dream might symbolize emotional pain or stress you're dealing with. The repeated instances of being shot could suggest that you feel attacked or hurt by someone or something in your waking life.
4. The Need for Support: Calling for backup in the dream indicates a need for support or help. This could mean that you are looking for assistance in navigating a difficult situation in your life.
5. Transformation and Change: The transition from Old Delhi to Bangalore with friends might signify a desire for change or a need to escape from current pressures. It could represent seeking comfort in familiar relationships or environments.
6. Confrontation with Mortality: The old man's self-harm could reflect fears or thoughts about mortality, loss, or the consequences of violence, which might be something you're grappling with on a deeper level.

To gain more clarity, consider reflecting on your current life circumstances. Are there any situations or relationships that feel conflictual or burdensome? Engaging in open conversations with trusted friends or seeking professional support could help you process these feelings.