I've lived many, many years with PTSD. Sometimes a road cycling situation will cause it to kick in and almost make me come unglued. My "attacks" always involve loud, sudden noises which are frequent on the road. There have been times when I've had to pull my bike off the road and try to re-boot my brain.
A few days ago I was about to begin a ride when a huge landscaping truck pulling a trailer sped down my road hitting all the bumps, causing one hell of a crashing noise. That was it for me...freaked me out. No ride.
I've been getting treatment. Understanding the beast has helped a lot, but it will never be cured.