Depending on the person, many different things could work like meditation, talking to friends, maybe having some tea, taking a shower, going for a drive, having some comfort food, and so many other things that allow you to release endorphins and relax your brain. : D
Depending on the area there could be organs shutting down, there could be paralysis there could also be a need for amputation depending on the body part.
You have to try a exercise and explain how u feel
Persons with breathing problems who want to start exercising should consult a doctor.