I am really sorry you are going through this. When my ex-T told me the same news I was devastated and only had two months. I am glad you have 8 months to process this. Leave nothing left unsaid and try to cherish your sessions and be in the moment. Its very painful and hard to loose a therapist. Let yourself feel whatever you need to. The pain does get better over time and you can carry them in your heart where they can stay forever.