Dreaming of becoming rich often symbolizes a desire for success, abundance, or fulfillment in your waking life. The feelings of sadness upon waking could suggest a few things:

1. Desire vs. Reality: You may have aspirations or dreams that feel out of reach in your current situation, leading to a sense of longing or disappointment.
2. Value and Worth: The dream might reflect your thoughts about self-worth and success. If you associate wealth with happiness, waking up might have brought a realization that true fulfillment comes from within, rather than material possessions.
3. Change and Transition: The dream could signify a desire for change or transformation in your life. The sadness might indicate fear of the unknown or reluctance to leave your current circumstances behind.

To address these feelings, consider reflecting on what "richness" means to you beyond financial wealth. It might be helpful to explore ways to cultivate happiness and fulfillment in your life right now, focusing on personal growth, relationships, or passions that bring you joy.