Noun
racing thoughts pl (plural only)
(psychology) A series of uncontrollable thoughts that switch rapidly between ideas, a symptom of bipolar disorder, anxiety disorders or other mental illnesses.
Once the racing thoughts began, I had trouble concentrating on any subject and I felt like I couldn't think at all.
Racing thoughts and misperceptions lead to frustration and decreased ability to communicate with others. Source: Internet
Racing thoughts also interfere with the ability to fall asleep. Source: Internet