Being unable to think of anything but one thing is read as a need that has grown too large for its frame. Tradition looks at what the fixation is standing in for.
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.