Trauma has impacted us in ways we have yet to understand. Our emotional response to our trauma is a result of the trigger. It is okay to not be okay. There is no golden rule that says our hearts and minds are not affected by trauma. The good news is we are loved by a God who knows all about what we go through. We are spiritual beings going through a human experience. In that experience, we face challenges to our faith. We can believe God and still be triggered by our trauma. God promises us a peace that passes all understanding in Phillipians 4:6-7 (AMP) "Do not be anxious or worried about anything, but in everything [every circumstance and situation] by prayer and petition with thanksgiving, continue to make your specific requests known to God. And the peace of God [that peace which reassures the heart, that peace] which transcends all understanding, [that peace which] stands guard over your hearts and your minds in Christ Jesus [is yours]." As we live, move, and have our being in and through God, our peace is at stake when our trauma is triggered. The truth is God has given us endless access to peace. 
It is up to us to preserve and protect it. There are three ways that we can hold on to our peace when our trauma is triggered. Take a pause, say a prayer, make a plan. We take the pause to bring our mind into subjection. What you say to yourself drives your emotions which drives your behavior. When you take that pause you allow the Holy Spirit to arrest what you are saying to yourself in that moment. You then say a prayer to make the voice of the Holy Spirit louder than your voice which is telling you to give in to your flesh. Finally, you make a plan to address how you are going to handle this moment if it comes around again. Trauma triggers come from an external source. There are some things that you have little to no control over. It is up to you to prepare your heart and your mind to hold on to your peace.