The following is from 2 references: Travell & Simons and Starlanyl & Copeland:

Jolt Syndrome, Cumulative Trauma Syndrome, Post-Traumatic Hyperirritability Syndrome, Stress Neuromyelopathic Pain Syndrome. Some of these are different names for the same syndrome. From what I read, some are related disorders.

The term "post-traumatic hyperirritability syndrome" (PTHS) was introduced to identify a limited number of patients with myofascial pain who exhibit marked hyperirritability of the sensory nervous system and of existing TrPs. This syndrome follows a major trauma , such as an automobile accident, or fall, or severe blow to the body that is sufficient to injure the sensory modulation system or brain stem. This is the system that translates impulses from different receptors in the body to the brain. The patients have constant pain, which may be exacerbated by a moving vehicle, by the slamming of a door, by a loud noise (firecracker at close range), by jarring (bumping into something or by being jostled), by mild thumps (a pat on the back), by severe pain (a trigger point injection), by prolonged physical activity, and by emotional stress (such as anger). Recovery from such stimulation is slow. Even with mild exacerbations, it can take hours to recover to previous level of pain.

With PTHS, the sensory moderating system has been modified to register extreme sensitivity to any kind of stimulus. Noise translates as pain. Touch translates as pain. Light, vibration, all these sensory signals reach the brain screaming “pain!”. People with this condition must avoid all types of strong sensory stimuli. They are a challenge to their health care team. They often can’t do any exercise and frequently can’t tolerate heat or cold.
Any additional accident or fall (even if considered insignificant) can cause an exacerbation of the hyperirritability syndrome for years. Unfortunately, with successive traumas, the person may become increasingly vulnerable to subsequent trauma.

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What I have been looking for is a research article I read about how pain lasting years (not just a fall or accident) can also conclude with PTHS; as an end-stage condition from years and years of non-relenting pain. I cannot find it again on the internet. Has anyone read something like this?I also wonder if you experience this at some times, and not so much at other times, if it is still a diagnosis of PTHS or is it something else? Sometimes, I can have lights on bright and enjoy fairly loud music, tolerate a dog barking, etc. At other times, the slightest noise can set off a chain reaction of pain in my skin, down and up my spine, in what feels like my bone marrow. Especially if it is a repetitive noise. If I sit in my living room in my lounger, and a car passes by on the street, (windows and screens and doors are closed) it can start up a sickening type pain and then every few minutes when a car goes by, the pain just seems to build and build until I can no longer stay in the living room.

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Fibromyalgia itself is a “Sensory Amplification Syndrome” where one is sensitive to sounds, smells, lights, and vibrations. That’s why it is also known as the “Irritable Everything Syndrome”. FMS sensitizes nerve endings, which means the ends of the nerve receptors have changed shape. Because of this, your brain might interpret different stimuli as pain, which makes the body start the “fight or flight” action of increasing adrenaline, Increasing heart rate, tensing your muscles, etc. So after preparing for danger, if these “geared up defenses” are not used, then our mind/body connection becomes anxious, resulting in even more pain.
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So that is what I am trying to sort out. I know some doctors propose that we do not worry about a specific diagnosis so much, that we think in terms of treating symptoms. I can agree with that some, but it also seems important to know why your life is the way it is. Sometimes it makes it easier to deal with the symptoms.

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Edited to Add: I just remember one of the things it said in the article I am trying to relocate. It said that one way to understand PTSH was to compare it to Post-Traumatic Stress Syndrome. Something trivial can trigger sensations because the pathways are there already-it is a memory of the body/mind. As in PTSD, where for example someone yelling can make you experience all of the physical sensations you had when someone was yelling and you were hurt-In PTHS, a trigger takes a shot-cut on a worn path to go right to sensation of severe pain due to the body/mind memory of it. (Now you see why I want the article-I cannot explain it right).