I think sometimes we believe we aren't allowed to "vent" our frustrations to God. Personally, I think God is ok with us doing just that. Look at what David said, a favorite child of God, who at times felt God had abandoned him. "My God, my God, why have you abandoned me? Why are you so far away when I groan for help? Every day I call to you, my God, but you do not answer. Every night I lift my voice, but I find no relieve. Yet you are holy, enthroned on the praises of Israel." (Psalm 22:1-3)
At ALL times we need to fear and be respectful of our God, but He knows our hearts and minds so why not share what you're feeling with Him? He knows our worries and frustrations without us saying a word. Cry out to God (as David did) if you reach a point of maximim difficulty. Pray for His hand to strengthen you and guide you through the storm you're facing. God is faithful. God loves you. God will never, ever leave you.
"Don't be afraid, for I am with you. Don't be discouraged, for I am your God. I will strengthen you and help you. I will hold you up with my victorious right hand." (Isaiah 41:10)