You are not alone with this challenge, this is one of the symptoms that comes with PTSD.
It is not just our mind that is affected by trauma, it's our entire body. It's something that presents after we experience a traumatic event that produces much more sensitivity and hyperawareness. When we experience a trauma so much is taken in all at once, more than we consciously realize and we are actually designed this way so we can survive better in our environment that can be unpredictable.

As we learn more about the human brain, we learn that our frontal lobe which is the executive part of our brain is the part that checks in and makes decisions, but the rest or our brain is designed to formulate a pattern that we operate off of that is more like an auto pilot. If you think about learning to drive a car for example, at first you have to be "conscious" about where everything is, and how to navigate the road ahead. You practice and most go slow while learning right? But, what happens is that as we learn and practice we begin to develop and automatic sense of what it is to drive a car so we don't have to think about each and every step of driving. Actually, we get so good at it that we can experience a dissociation and go into auto pilot and suddenly forget to pay attention, it's actually scarey when we catch ourselves doing that. However, if we experience someone else suddenly hitting us, or we somehow lose control of the car, that changes how we drive to where we can become a driver that is more alert and we practice defensive driving. That's because when we experienced something that was a threat and dangerous, we recorded it so we would pay attention more, this is our way of developing "survival".

Human beings are designed to "sound an alarm", it's so crucial to our ability to survive and thrive. We are also designed to revisit something that can be a major threat because we are always looking to learn about all the things that could be a major threat to survival. However, in our design is also becoming more sensitive and a desire to avoid. All mammels have that instinct because having that also is part of changing to ensure survival.

Trauma does change a person and does create more sensitivity, and because it changes us we get confused because of this change and increased sensativity. If we come to understand what this means, it can be a comfort and one can begin to slowly learn how to develop a new sense of understanding and awareness. If someone receives the right validation and understanding of this challenge in time this person can regain a better sense of control and understanding of this new awareness and these symptoms, while they don't disappear completely, will settle down to where a person can regain a sense of control again.