The ghoul feeds on what is already gone, so tradition reads it as dwelling on old losses or being drained by something finished. It can point to a habit of returning to what no longer nourishes you.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.