Dreaming about a chestnut tree means you are feeling nostalgic when your life was simpler. It might be a time when you were young, when you were friends with everyone you meet, or when your health was better at its peak. You long for those days, but you know that those days are just memories. You have to learn to live in the present and trust that things will work themselves out. Focus on the present moment.
If you come across a chestnut tree in the waking hours, stop for a moment to appreciate your past then move on with tackling the next phase of your life.