Dreaming about the end of the world can often symbolize feelings of anxiety or a sense of impending change in your life. The fact that you are aware of the deteriorating situation while others remain oblivious may indicate that you have a heightened sense of awareness or responsibility in your waking life. You might feel burdened by the knowledge of challenges or issues that those around you are ignoring.

The imagery of your colleague playing tennis, coupled with her peeling skin, suggests a struggle with communication or connection. Tennis is a game that requires cooperation and awareness of each other's actions, which might reflect your feelings about relationships in your life. Her physical peeling could represent vulnerability or the idea that people may not always be as they seem, which can lead to feelings of discomfort or disconnection.

The lion on the flag with a rainbow background might symbolize strength and courage, but the rainbow could suggest complexity in emotions or situations—perhaps indicating that there are diverse aspects to your experiences or feelings about the end of something significant.

Overall, your dream seems to reflect a deep internal struggle with awareness, connection, and perhaps feeling isolated in your perceptions of reality. It may be beneficial to reflect on areas in your life where you feel you are more aware than others and how this impacts your mental state. Consider finding outlets for this awareness, whether through conversations with trusted friends or creative expression, to help ease the mental burden you’re experiencing.