The problem is P.T.S.D makes your feelings of distrust and fear much more intensive and also random. i have suffered from P.T.S.D since i 11 years old and now i'm 59 and these feelings of distrust and fear can still be really strong.
What helped me enormously was to realise that both distrust and fear are good at the right time, but not when it is inappropriate.
For example to distrust someone who lies to you is wise and distrust serves a good function at such times keeping us safe from lies. The same with fear. If you cross the road and then suddenly see a car a few meters away from you racing towards you, then fear comes in handy. It gives us lightening fast reactions and we can jump out of the way faster then if we weren't so alarmed.
However when fear comes when there is nothing to fear, as it does within people who suffer from P.T.S.D so often, then it is best not to believe a thought or feeling coming your way and disbelieve and distrust everything you hear, for fear lies through its teeth and gets us into the most horrible states of being.
i found the truth of God to be the most reliable to help me fighting distrust, anger and fear. For as long as i stay in His loving truth i'm safe and can handle the onslaught. Faith in His loving truth is essential surviving P.T.S.D
The truth of God is as solid as a rock and all my inner upheaval runs dead upon it. For years i ran around fearing and distrusting God - such awful realities living within me instead of His loving truth. For that is the ultimate answer to my questions about change - The bible says what you sow you shall harvest. So if you sow distrust, fear and anger then these are the inner realities you will harvest in your daily life, if on the other hand you sow love, kindness, gentleness, caring, sharing, long suffering and endurance then such inner realities will serve you during your hard times.
Cultivating God's good life over against my bad life has sure worked wonders in my life. For years it looked like i would be a prisoner of my emotions all my life but Jesus has set me free in His love and giving me the ability to hold onto His loving truth during times of anxiety, distrust or anger.
i found that good counselling has also really helped me understand where to bring my strongest gone haywire emotions and how to best deal with them. i found that almost all the emotional pain i was suffering was because i wasn't walking in the truth of God in such a part of my life. i sure was divided within because of the trauma i suffered, letting Jesus bring me back together again has been a wonderful experience.
So please don't despair your fear or distrust. Lear to go to Jesus during such times and ask Him to help you stay in His loving truth. Honest He is great! Rebuilding us stronger than fear or distrust or any other raw emotion can throw at us.
Be of good courage.