Dreams involving waiting, injuries, and feelings of frustration often reflect our emotions and experiences in waking life. In your dream, the lip injury could symbolize a sense of vulnerability, perhaps relating to your daughter's well-being or your protective instincts as a parent. The emergency room represents a place of healing and support, but the delay and the chaos with the check-in may signify feelings of helplessness or frustration in situations where you feel urgent care is needed.

The man yelling at the trainee could represent your concerns about how others handle stressful situations, or it might reflect your own feelings of being overwhelmed. Your empathy for the trainee suggests that you may value compassion and understanding in difficult circumstances, even when things don’t go as planned.

Overall, this dream could be urging you to acknowledge your feelings of frustration while also encouraging you to extend empathy towards others who are struggling. It may be beneficial to explore ways to manage these feelings in your waking life, perhaps by finding constructive outlets for your emotions or seeking support when needed.