The psalms reflect both trust and a lack of trust yet all of them are regarded as songs and poems of faith, how can that be if faith is trust?
Psalms 22:1-2* My God, my God, why have you abandoned me? I have cried desperately for help, but still it does not come. *2* During the day I call to you, my God, but you do not answer; I call at night, but get no rest.
Psalms 25:1-2* To you, O LORD, I offer my prayer; *2* in you, my God, I trust. Save me from the shame of defeat; don't let my enemies gloat over me!
Psalms 38:1-8* O LORD, don't punish me in your anger! *2* You have wounded me with your arrows; you have struck me down. *3* Because of your anger, I am in great pain; my whole body is diseased because of my sins. *4* I am drowning in the flood of my sins; they are a burden too heavy to bear. *5* Because I have been foolish, my sores stink and rot. *6* I am bent over, I am crushed; I mourn all day long. *7* I am burning with fever and I am near death. *8* I am worn out and utterly crushed; my heart is troubled, and I groan with pain.
Psalms 39:1-6* I said, "I will be careful about what I do and will not let my tongue make me sin; I will not say anything while evil people are near." *2* I kept quiet, not saying a word, not even about anything good! But my suffering only grew worse, *3* and I was overcome with anxiety. The more I thought, the more troubled I became; I could not keep from asking: *4* " LORD, how long will I live? When will I die? Tell me how soon my life will end." *5* How short you have made my life! In your sight my lifetime seems nothing. Indeed every living being is no more than a puff of wind, *6* no more than a shadow. All we do is for nothing; we gather wealth, but don't know who will get it.
None of these show a final loss of trust in God yet the questions and the pain are real reflections of confusion about God's dealings. The book of Ecclesiastes also reflects on loss of trust and doubts as well as confusion and pain. Job suffered greatly for reasons undisclosed to him and that left his wife advising him to curse God and die.
It is a mistake to simplify faith to "trust" alone. It is much more complicated and nuanced than that.