Your dream presents a rich tapestry of symbolism and emotions. Here are some interpretations to consider:

1. Apocalypse Setting: The apocalyptic backdrop may symbolize feelings of chaos or fear in your waking life. It could represent a significant change or upheaval that you're currently navigating.
2. Grassland: This natural setting might reflect a sense of freedom or the desire for peace amidst the chaos. It could also indicate a longing for simplicity or a return to basics.
3. The House: Houses in dreams often represent the self or your mind. The fact that the inside of the house was small like your room might suggest feelings of confinement or a lack of space for your thoughts and emotions.
4. Infected Person: This figure could represent something in your life that feels threatening or harmful—perhaps a negative influence, fear, or anxiety that you feel the need to confront or eliminate.
5. Volunteer to Kill: Volunteering to take action, especially in such a violent way, may indicate that you are willing to confront difficult issues in your life, but it also suggests internal conflict about how to handle these challenges.
6. Choking and Awakening: The moment where the infected person grabs your neck and tells you to "wake up" might signify that there are issues or emotions you need to confront in your waking life. It could be a call to acknowledge something you've been avoiding.

Advice: Reflect on areas in your life where you feel overwhelmed or threatened. Consider what negative influences you might need to address. This dream could be prompting you to take action in a way that is more constructive and less harmful to yourself and others. Embrace the call to "wake up" by becoming more aware of your feelings and circumstances.