A flatline on a monitor is read as energy, feeling or motivation dropping to nothing. Dream books see it as emotional numbness or a project whose life has run out, not as anything about health.
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.