For those interested.
dr Michael van elzakker at Harvard symposium gave great and relevant talk (on YouTube
) most relevant bit mentioning concussion starts from about 9mins in
The Transcript below

might not be fully accurate , I did it !
BUT It has recognition of overlap of m.e and concussion symptoms and he’s exploring that I think.
“The microphages of the brain, the “ big eaters” which eat up particles and pathogens, part of the immune system, are called microglia
When they detect cytokines or pathogens or anything to do with damage they activate, and change shape and all these little arms kind of retract, the cells themselves become thicker, this is called the state of activation and when that happens then produce a whole bunch of stuff and that includes things that excite neurons, that includes more cytokines and that includes a protein called trans locator protein. The trans locator protein is what we look for in these PET scans to see if there’s neuroinflammation
and importantly the neuro excitation modulators, (glutamate, prostaglandins...etc a whole bunch of stuff that excite neurons ) part of what that does is to make it really hard to concentrate, that’s the reason for example when someone’s has a concussion they can’t think straight, that’s the reason when someone’s had a concussion they are really sensitive to light and sound, these cells act as amplifiers of normal nerve signals and so we think that if neuroinflammation , as measured by microglia activation, is happening in this condition then that may explain some of the cognitive symptoms.
And importantly for a sort of sepsis model, these cells can enter a state which is known as primed. Which means that if they have previously encountered something really bad, whatever infection or injury they actually become kind of sensitised, a little bit hyper vigilant if you will,& we can not actually measure this yet, we don’t know how to do that, but it’s a functional thing we ... if we deliver the exact same level of stimulation to a primed microglia you get a huge response, even bigger than the previous one, and so this might explain for example why people in this condition have an extra big response to small stimuli, so for example if your microglia were primed that could explain why you are sensitive to chemicals,why relatively small subsequent infection can cause a really bad crash, why any provocation can cause an ongoing lengthy crash, so it is one of the things that we are trying to figure out. “