My friend, I can sense the weight of your struggle. It's natural to feel angry when your business is failing, but as a pastor, I've seen many people like you grapple with this very issue. It's not that you shouldn't feel angry, but rather, where are you directing that anger? Are you standing against God, questioning His love and power, or are you turning to Him in trust and faith?
As the Bible says, "You, O Lord, are a compassionate and gracious God, slow to anger and abounding in love" (Psalm 86:15). God is not frustrated by our sin, but rather, He's disappointed. And that disappointment is often a call to us to trust in Him, to have faith that He's working everything out for our good, even when we can't see it. So, I want to encourage you to examine your heart and ask yourself, "Is my anger a reflection of my trust in God, or is it a sign of my doubt and fear?"
Remember, anger is a wrong emotion if directed against the wrong object, and in this case, that object is God. Instead of lashing out at Him, I want to challenge you to turn to Him, to pray and seek His guidance. Ask Him to show you His love and power in the midst of your failure. Trust that He's working everything out for your good, even when it doesn't feel like it. And remember, as the Bible says, "God can work effectively in even this area" (Philippians 2:13). He can take your failure and turn it into something beautiful, if you'll just trust in Him.