Dreams About Cats

Hello, 

I have a recurring nightmare every few months, each time in a different form, and I feel that it has a message that I am unable to understand. The nightmare is about cats. In one dream I dreamed that I woke up and saw black cats all around my bed, and at the foot of my bed there was a gray cat. I try to make them go away, but they do not move. In another dream I dreamed that I arrived at my car, and on the roof of the car sat a cat with a great deal of waste around it, and inside the car there were many additional cats, and again, when I try to move it, it does not move. This is how the dream repeats itself every few months, in different forms but with the same principle. The dreams arouse in me a feeling of disgust and fear, and when I wake up from them I am unable to calm down. I would be glad if you could tell me what the meaning of the dream is, or what its message is. 

Thank you very much.