I would have agreed with you when I was younger, but now that I’m older I think I changed my mind, I’m not so sure it’s fair to make people suffer with late-stage terminal diseases where their whole life is reduced to suffering.

(that is to say, I do not really believe that there is such a thing as a “fate worse than death” so to speak, because I believe that death is the least functional state a person can have and anything above that implies at least some functioning even if that state is still highly undesirable)

Is constant, unending suffering where you are in a state of constant unimaginable and untreatable pain a state worth living, though? Should people have to live that way, just because death is “worse”?

Everything is in someone’s head. Without consciousness, we are nothing, so saying something is “in someone’s head” is the wrong way of putting it.

Have you ever heard about functional neurologic disorder? Just because symptoms are psychosomatic does not mean they are not actual symptoms.