Thank you for sharing your intense dream experience. It sounds like a deeply unsettling nightmare that has had a lasting impact on you. Dreams involving animals, particularly in a zombified or threatening state, can symbolize various fears and anxieties. Given that your biggest fear is zombified animals, it’s possible that this dream is a manifestation of your subconscious confronting that fear.

The deer and boar could represent aspects of yourself or your life that feel out of control or threatening. The intense gaze of the deer might symbolize a fear of being watched or judged, while the boar crashing through your window could represent an invasion of your personal space or a fear that something you cannot control will disrupt your life.

Your reaction upon waking—jumping out of bed and seeking refuge in your bathroom—indicates a strong fight-or-flight response, suggesting that this dream tapped into a deep-seated fear. The fact that you still experience flashbacks may be linked to unresolved trauma or anxiety, possibly compounded by other mental health challenges you mentioned.

It might be beneficial to explore these feelings further, perhaps with a mental health professional who can help you process both the dream and your experiences with hallucinations. Engaging in grounding techniques or mindfulness practices might also help when you encounter flashbacks. Remember, it's okay to seek help to understand and cope with these feelings.