First of all, When you have disturbing dreams, it's often because your mind is trying to tell you something important. What interests me most about your dream is all the creatures. Do you normally dream of so many different animals? I think that might be a major clue here. How do you feel about each of these animals in waking life? What do you associate them with? For example, personally I'm afraid of bees IRL, so in my dreams, they represent anxiety and worries.