High levels of arousal, which can feel unpleasant, are associated with the brain's attempt to learn during periods of high uncertainty.

“I was experiencing a very high level of arousal and it's very very unpleasant now my husband knows me very well and he said yeah there's a lot of uncertainty and I said I know now he didn't say to me well you're anxious and you just don't really know it I because I wasn't anxious I was feeling uncertain and as you know or maybe people are know that when there's a lot of uncertainty there's also a lot of arousal because the brain is attempting to learn and the neurom modulators that are important for learning new things happen to also cause uh a subjective sense of arousal”