I am afraid of spiders. What does it mean if you dream of spiders on a wall each one progressively larger than the next and then the 4th one crawls down the wall and chases you?

The Spiders are symbols representing problems that are causing you anxiety in real life. Each issue seems more difficult as time goes on. Being chased suggests that as your problems seem to get worse, you want to run away and just escape. Your mind is using this dream to tell you that you need to stop avoiding your problems, confront the issues and solve them.