Dream scenario
The Flashback of Annoyance
You find yourself trying to deploy a powerful, unseen agent (the acaricide) against a specific, irritating memory that keeps resurfacing, refusing to fade into the background.
Symbolic reading
The memory represents a minor past slight or perceived failure that, while small, continues to 'bite' at your present emotional equilibrium. The dream is showing your subconscious efforts to neutralize its emotional residue.
Practical reading
You are likely stuck in a loop of ruminating on a past event. The dream suggests you need to consciously decide to stop revisiting this memory and allow it to rest, rather than trying to fight it off.
Psychology explanation
This scenario reflects the mind's attempt to achieve emotional closure. The memory is not being processed; it is being attacked, indicating the emotional charge is still active and needs resolution.