This dream may symbolize feelings of loss and struggle in your waking life. The black water in the shower could represent negative emotions or thoughts that have risen to the surface. The bad weather and destroyed cars could represent external challenges or obstacles that are causing chaos and destruction in your life. The fact that your car was one of the destroyed ones could suggest a sense of powerlessness or vulnerability in the face of these challenges. The crying over your last car payment could symbolize financial stress or the fear of losing something valuable. The presence of your deceased mother could represent unresolved emotions or unfinished business with her. The fact that she kept falling asleep behind the wheel could symbolize a lack of control or direction in your life. Overall, this dream may be reflecting your subconscious fears and anxieties about facing difficult situations and the need to find strength and resilience to overcome them.