From 白居易's Tang-dynasty poem 《长恨歌》: 天旋地转回龙驭 - 'when heaven and earth turned and the emperor's chariot returned.' Originally describing the tumultuous restoration of Tang power after the An Lushan rebellion; later generalized to vertigo and upheaval.
usage
Two live meanings: (1) physical dizziness - 觉得 / 感到天旋地转; (2) world-turned-upside-down shock at news or events. Context disambiguates.