A lobotomy in a dream is read as the fear of being silenced or made compliant, of losing what makes you yourself. Tradition takes it as pressure to switch off feelings or thoughts that others find inconvenient.
Has this come up in your dreams before? What was going on in your life then?
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.