Not sure if this is actually related to ME, but may be of interest. https://www.bbc.co.uk/sport/football/61123213
Worth reading this from an article about her issues with pericarditis back in 2019/2020. "The former Reading forward had kept the extent of her illness concealed until February when Chelsea published an interview where she spoke of being diagnosed with pericarditis. She was unable even to become frustrated by the speculation over her health, form and fitness because she “just felt so poorly”. “I was in a place where I just completely zoned out of everything. I was a ghost, a zombie, I wasn’t really there. I went from pushing myself to being able to train all week after coming back from injury and getting back involved to not being allowed to walk up the stairs more than twice in a day,” Kirby told Scott. “That’s how extreme it was. I wasn’t allowed to go for a walk, I wasn’t allowed to do anything that would put stress on me, I had to lay on the sofa. For two months.”" https://www.theguardian.com/footbal...n-kirby-came-close-to-retiring-due-to-illness
There's starting to be quite a bit of evidence that myocarditis and/or pericarditis may be a factor here, perhaps impairing the damage repair progress with exertion leads to small weaknesses?