Th brain Is not the main source of inflammation per se. The inflammation starts from other sources like gut issues, nutritional deficiencies (like in my case low ferritin), poor diets, infection, thyroid and so on. But it is when it is left untreated and we keep marching on even when our bodies are giving us signals, that it becomes chronic and reaches our brains and that is when we experience depression, anxiety, and what we experince as adrenal fatigue. food allergies and allergies for that matter are an oversentization of our bodies while inflammed. It is not that we r allergic per se but that everything is in an overactive state because our brains are already constantly signaling a stress response to to inflammation. The thing about adrenaline surges is that adrenaline is released in response to inflammation to stop the inflammation process. In the short term it works but when inflammation becomes chronic so does adrenaline and adrenaline over time increases inflammation. So as my doctor explained it to me it is like constantly shifting from the gas to the break pettle like in a car but in our bodies. Gas is adrenaline then inflammation, or break, to stop adrenaline. Then adrenaline to stop too much inflammation and it is a vicious cycle. So when we have these crashes they are just are bodies going through cycles of inflammation and adrenaline. Which of course would make you clench up even if you are unaware. I told my doctor that I didn't always feel th adrenaline and he said especially in my case that it is always there as that is how my body is creating the energy it needs to function, because naturally it is not, based on my low ferritin iron. And again the low ferritin I have had for years and was a symptomatic until it became chronic and to a level that the inflammation reached the brain. That is why a lot of people were like well I was working 40 hours and running and playing hockey and doing all these things and then boom. Most of us were running on adrenaline (therefore increasing inflammation) for a long time.
Anyways again I hope that this is a good explanation. It probably doesn't make as much sense as it does coming out of his mouth.