feels like you might be forgetting something important. feels like being nervous when there is no reason. can cause you to experience suspicion of any positive feedback. can manifest itself physically in tapping, shaking, butterflies in the stomach.
it is the body constantly pumping fear in response to irrational thoughts, while the brain knows exactly how irrational that fear is. it feels like being crushed under a press machine. our primitive bodies simply have no defense mechanism against it. it is exhausting to fight a physical reaction to a threat that only exists in your mind.