What is the reason for the sudden shift from self-confidence and social acceptance to anxiety and inability to laugh after an emotional experience, and how can this be treated?

A Muslim should rely on his Lord, trust in Him, have self-confidence, and strengthen his faith. Lack of self-confidence stems from the whispers of Satan, and from weakness in faith and character. The Prophet, peace and blessings be upon him, warned against helplessness. As for the cure for loving and adoring a created being, it is found in sincerity towards Allah, fearing Him, and desiring what is with Him.