PSA: This is not only meant as a reply to Valleybob, it's for anyone here who could find this useful.

I also think the neck plays a role with this sensitivity. I have had a lot of problems with my neck. I used to be extremely sensitive to the slightest jolts, and even just stepping too hard or moving my head too rapidly could increase the symptoms a lot. When I look back, my neck was very weak and inflamed back then. It had become weak from all the bed rest (bad idea), and even before all my PCS/new neck problems I probably had weak neck muscles since I had forward head posture (still have it though) I am sure the are some issues/instability in the upper cervical area too, as is common among people who have experienced a concussion, and as I've come to learn it might be common following years of bad posture. I recommend reading this: Atlas joint instability: Causes, consequences and solutions - MSK Neurology

My symptoms are so much worse when my neck muscles are tight and when there is more inflammation in there, so I have theorized that when I experience jolts and bumps, the inflammation in the neck increases and thereby the symptoms increases as well. Icing the neck helps my symptoms, also eating anti-inflammatory foods and (especially) spices (rosemary, cayenne, pepper, basil etc.) immediately helps a bit too. These things always help me though, so I'm not sure to what degree the symptom improvement is tied to the worsening after a jolt or bump, especially since I started doing it after the most extreme sensitivity faded. I am not entirely sure that neck inflammation is the cause of the sensitivity, and I hope some of you reading this can further test this theory.

Now I don't get the same symptom-increase from jolts, but I still feel very wary of these things. Now I think it's more about my neck being too stiff and the cervical vertebra not being mobile enough. I have had a dynamic x-ray done and they found that most of the joints in my neck were barely moving upon flexion. The upper cervicals and one joint lower in the neck was the ones doing all the bending while the others were very stiff. I think that this, along with neck inflammation and having weak muscles all over my body and neck decreases my body and neck's ability to absorb shocks and impacts. So it feels very uncomfortable to walk without a specific pair of shoes I own with a layer of two soft insoles and an extra layer for the heel.

If you have this kind of extreme sensitivity I highly recommend making your shoes more shock-absorbing by adding insoles. This will prevent you from stiffening up your muscles while walking to try to avoid these symptom-triggering jolts. Tensing up your muscles while walking will make your mucles and spine become more inflexible and stiff and you will feel more shocks when walking.

So anyways, the jolts and shocks doesn't affect my symptoms much anymore. I have even hit my head two times into some branches without getting worsening of symptoms like before - only temporary from the anxiety that followed.

I don't know if it was a coincidence or not, but the period when the sensitivity started to imrpove was when I started eating more anti-inflammatory. There have been people on this forum that has said that it helped their sensitivity, so maybe it can be something to try - it's a very healthy way to eat anyways and it's probably good for your brain.