Claire has taught many students to overcome and manage their own fears and limits. Sometimes these things can be brought on by experiences, but more often than not they caused by us getting to the end of our current knowledge. As we struggle to progress, we don't have the knowledge so our body naturally tries to protect itself. Hence, the sudden lack of  confidence to deal with certain situations as they show up.  Listen to it , don't push through it. Build your knowledge and skills, your confidence will grow and grow