fluster
/ˈflə-stər/
verb
to put into a state of agitated confusion : upset
to make tipsy
The speaker was obviously flustered by the interruption.
discompose disquiet disturb perturb agitate upset fluster mean to destroy capacity for collected thought or decisive action. discompose implies some degree of loss of self-control or self-confidence especially through emotional stress. disquiet suggests loss of sense of security or peace of mind.
noun
a state of agitated confusion
They had been talking about it for days, and when they were getting ready to go out they were all in a fluster.