John 14:27 "Peace I leave with you; my peace I give you. I do not give to you as the world gives. Do not let not your hearts be troubled and do not be afraid."
The peace that Jesus gives us is unlike any peace that the world can give. The peace of the Lord is true and everlasting. The peace from the world is false and temporary. The world tries to convince you that you will have peace if you buy this, eat that, do this, not that etc.. That kind of peace is temporary, but again the peace of the Lord is everlasting.
Philippians 4:6-7 "Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God. And the peace of God, which transcends all understanding, will guard your hearts and minds in Christ Jesus."
God cares about every part of your life, even the little things. When you have a decision to make, whether its big or small, pray about it. Ask God to bring you His wisdom and peace to make the right decision. If you don't receive God's peace, then it's probably not what God wants for you, at least not at that particular time.
God wants to protect you from falling for false peace. The world will push their agenda on you, trying to brainwash you into believing their lies of doing what they want you to do, making you believe you will have peace. Worldly peace is false and temporary. God's peace is true and everlasting.
When you feel uncertain about anything in your life, whether it's a decision to make, illness, financial, the future, seek God's face. God will never leave you. He loves you and wants you to seek him, when you seek Him you will find him.
Matthew 7:7-8 "Ask and it will be given to you; seek and you will find; knock and the door will be opened to you. For everyone who asks receives; the one who seeks finds; and to the one who knocks the door will be opened."
2 Chronicles 7:14 "If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then I will hear from heaven, and I will forgive their sin and will heal their land."