"How me and my M.E became worse"
There are far too many stories like this. People with ME/CFS are being told by many health professionals that their symptoms are just in their head and that, to get well, they need to exercise. The problem is that research is increasingly finding that on a physiological level, people with ME/CFS can be damaged by exercise. Our cells don't make ATP (energy) properly so, when it's used up by exercise, our system collapses. Many people have been made worse by either pushing their bodies to keep going with their lives or by exercising (or both).
I did graded exercise therapy two years ago (at the suggestion of my GP). I was walking for 2 minutes twice a week (I would go to the street corner and back). It would take me 45 minutes to recover from that walk, and then I'd be wiped for the rest of the day. Logic suggests that, over time, my body would gain fitness and I would be able to increase my walking duration and feel better from the walks. Instead, the opposite happened. At the end of 3 months, I still couldn't walk more than 3 minutes, and it was taking me longer and longer to recover. I wasn't feeling better, I was feeling worse. During that time, I saw a specialist who told me to increase my walking to 15 minutes a day, three times a week. I just stared at her, when she suggested it, wondering how I would do that. She must have seen the puzzlement on my face, so she (un)helpfully suggested I break it down into 5 minute chunks, and do them across the day.
Then I started reading the research into exercise with ME/CFS. Things like abnormal ATP production, lactate levels, gene expression, changes in blood metabolites following exercise. Abnormal VO2 Max test results are such a reliable indicator of ME/CFS that a 2-day cardiopulmonary exercise test (CPET) was proposed as a diagnostic test for ME/CFS, except that the test is dangerous for us in that it can take months for people to recover from (the risks are so high that they won't do the test on someone like me). Because of the risk of harm, the test isn't recommended as a diagnostic tool.
After reading the research, instead of following the advice of the doctor to increase my walks, I stopped walking... and I started to improve a little. I wasn't cured, but I wasn't getting worse anymore. (Unfortunately, months later, I got an infection and then went backwards for 6 months, but that's another story!).
At a recent international ME/CFS conference which world leading researchers attended, provocation studies (in which exercise is used in a carefully controlled way to exacerbate symptoms, and measure physiological correlates) were a key feature. These studies are like giving sugar to a bunch of diabetics, in order to understand the process of diabetes and find ways to test for and measure it. This is how exercise (& exertion generally) is being viewed by ME/CFS researchers now, like sugar to diabetics.
It is becoming increasingly acknowledged, within the research community, that ME/CFS is a hypometabolic state. Our bodies have shut down metabolism (energy production). Many think that this shut down has a protective function (to protect us from heart failure - one well known doctor has noted for 20 years that we look, in many ways, like people with functional heart failure, but that something prevents us from crossing that event horizon - from some sort immune process or something else (still many unknowns)).
Despite this, the prevailing view within the medical profession (most of whom do not keep up with the research) is still that this condition is simply caused by activity avoidance, and that people need to be encouraged to exercise to recover. So, despite the researchers viewing exercise for people with ME/CFS as sugar is to diabetics, doctors all over the world are recommending it to their patients. When their patients say that they feel worse, the doctors tell them that it's in their head, that it's a normal part of regaining fitness, and to keep going. But it isn't. It's dangerous.
Please, if you know someone with this illness, never encourage them to exercise, or to push through. If they have been misdiagnosed with ME/CFS (which frequently happens) and instead have some form of idiopathic fatigue, they may respond to exercise. But if they have ME/CFS, there is a very strong chance that they won't respond well, and that they will instead be damaged by it.