Dreams about returning to a childhood home can be deeply symbolic and often reflect unresolved feelings, childhood experiences, or your current emotional state. In your case, the discomfort and strange symbolism may represent various aspects of your life and psyche.

1. Childhood and Family Dynamics: Your childhood room often symbolizes your formative years and the relationship you have with your family, particularly your mother. The discomfort you feel in the dream, especially with your mother’s presence, could indicate unresolved issues or feelings of being controlled or overwhelmed by her influence in your life.
2. Sense of Self: The fact that you are now living in that room with your current belongings suggests a confrontation with your past self and how it relates to who you are now. The feeling of contamination and fear associated with the room might reflect feelings of inadequacy or emotional trauma that you still carry.
3. Addiction and Coping Mechanisms: The presence of the edibles container might symbolize your coping mechanisms and how you deal with discomfort or stress. Hiding it could indicate feelings of shame or fear of judgment, particularly from your mother.
4. Fear of Vulnerability: Your struggle to express unhappiness and the dismissive response from your mother could highlight your fear of being vulnerable or not being taken seriously. This might reflect a broader theme in your life where you feel unheard or invalidated.
5. Symbolism of the House: The dilapidated state of the home could represent feelings of neglect or decay in your emotional life. The unfinished basement may symbolize hidden fears or unresolved issues that you have yet to confront.
6. Dismantling the Wall: Your action of dismantling the wall with inappropriate images suggests a desire to reclaim control over your space and confront aspects of your past that make you uncomfortable. It symbolizes an effort to remove unwanted influences or memories.

Overall, this dream appears to be a significant exploration of your past and current feelings regarding family dynamics, self-identity, and coping mechanisms. It may be beneficial to reflect on these themes in your waking life, perhaps considering how your childhood experiences shape your current relationships and emotional well-being. If these feelings persist, speaking with a therapist might provide additional insights and support in processing these complex emotions.