>It's obvious that her COVID infection did something to cause her to go from being an amateur astronaut to being bed-bound We know that infections cause sickne

>It's obvious that her COVID infection did something to cause her to go from being an amateur astronaut to being bed-bound We know that infections cause sickness behaviour (fatigue, depression, etc.) due to the effect of the cytokines on the brain. The interesting thing is that the brain itself releases similar cytokines in response to mental stress, and mental stress also activates the glial immune cells in the brain. Infections also activate the HPA axis (the body's stress system) in the same way as mental stress does. This is to give the immune system energy to fight the infection, and also to prevent a fatal over-reaction by the immune system. Chronic long-term stress can result in a blunted HPA axis response, and this is commonly seen in ME/CFS. Patients who have been bedbound with ME/CFS report that they were trapped by fear that there was something wrong with their bodies, and they felt fear when going outside or doing anything, and this caused further symptoms. Reducing that fear, and experimenting with activities again in a calm manner seems to be key to recovery. Looking at some of the tweets from physics girl, it looks like she may be stuck in this state.