Beaking down "what happens" when you flare-up and coming to understand why your body migth tend to resort to these responses to certain triggers, usually in an effort to help you (an understanding that can occur to you when you slow down enough to listen, instead of letting fear lead the research party) can make for a big breakthrough in managing these dips...
Hard science has uncovered a mechanism whereby the same collagen abnormalities in EDS that make joints especially flexible seem to affect blood vessels, making those with it prone to accumulation of blood in the veins of the legs, an effect that may lead to exaggerated cardiovascular responses to maintain the output of blood from the heart. This and other foibles, which I feel are versions of the same response, put those of us with this issue under immense pressure and strain, all the time, as our version of "normal" so just imagine how much we then react to any additional triggers, to which we tend to be hypersensitive (I share my about theory about that too...), setting off our nervous system at regular intervals in a way that has nothing inherently to do with mental health...although, no surprise, it can start to manifest as anxiety over time. Joining some dots and celebrating just how much people with hypermobility type EDS deal with as their daily benchmark...plus some practical ways of making it better.
The extreme effects that resulted when two of us revisited eating sugar after a long break from it reminded me that these are the normal outcome of sugar consumption for all people. So the variance isn't in the biological effects but in how much people notice them or have adapted to shield themselves from, or absorb, the backlash (though the resultant health issues are seldom avoided so much as redirected into another form of expression; often a more severe health issue, further down the line). Most people push on through the effects of sugar without really acknowledging that they are there; as I know I did, for years. The more we consume the crazy amount of sugar our modern diet makes almost compulsory and extremely (shockingly) normal, the more we become (ironically) immune to it as the nervous system is pushed over the limit to where it has no choice but to turn down its own sensitivity to everything, even those things we want to experience, in order to cope; like a form of self-created paralysis. Its as though sugar only knows one setting - one that makes us receive more sensation, delivered in the most abrasive way possible and it is more than our nervous system, which longs to experience many things but wants to be way more discerning than that, can cope with. We become over-stimulated...and so we break down or are forced to buffer ourselves like we are under constant attack and, of course, some of us stop feeling at all.
If healing is a return to wholeness, then loss of good health is the ultimate fragmentation of the self; a state, made manifest, of something much deeper occurring on the inside. Ten years ago, my health crashed in the most spectacular way. Across the decade since that time, I find been have steadily regathering all of the scattered parts of myself and putting them back together in such a way that I now find I am much more than the sum of my parts. This is my journey - shared.