If I really trusted God, would I still be this anxious? I feel like my worry is proof that my faith is not working. Is that what it means?

“I cried unto God with my voice, even unto God with my voice; and he gave ear unto me. In the day of my trouble I sought the Lord: my sore ran in the night, and ceased not: my soul refused to be comforted. I remembered God, and was troubled: I complained, and my spirit was overwhelmed. Selah.”

Asaph, a worship leader, writes that he cried out to God, that his soul refused to be comforted, and that when he remembered God he was troubled rather than soothed. This was placed in Israel's public songbook. The community sang it. That tells you something about how the Bible treats a faithful person who is not coping: it does not edit them out, and it does not treat their distress as a disqualification.

“And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief.”

A father brings his son to Jesus and says, if you can do anything, help us. Jesus presses the if, and the man answers with one of the most human lines in the Gospels: Lord I believe, help my unbelief. He does not resolve the contradiction. He confesses it. And the healing goes ahead anyway, on the strength of a faith that openly admitted it was mixed.