The phrase "felt oneself again" indicates a restoration of energy, confidence, and strength after a period of illness, stress, or weakness. Antonyms for this expression could include feeling unwell, weak, drained, fatigued, dejected, hopeless, or insecure. These antonyms reflect a state of physical, emotional, or psychological depletion that prevents a person from functioning at their best level. While feeling oneself again implies a sense of renewal, motivation, and purpose, the antonyms suggest a lack of vitality, direction, and joy. By recognizing and acknowledging these contrasting states, individuals can identify their own needs and take steps to improve their well-being and happiness.