I've never been catatonic and know very little about the subject. I was dx'd with conversion disorder at one time (I think it is called something different now, but idk) because I would experience paralysis of my arm under extreme stress, but I'm not sure I'd consider that being of any correlation to this. I do have a great aunt who would experience catatonia, but the family doesn't really talk about it. The main instance I know of with her is she'd get paranoid delusions and then disappear and family would go out and search for her and she'd be hospitalized. After at least one of these episodes they found her sitting in a chair completely unresponsive to external stimulation and her legs were weeping from edema and lack of movement. She's spent the majority of her life in hospital (for psychiatric reasons) but like I said, family doesn't talk about her.