How about using a dedicated paper notebook to log everything that comes to your mind related to this illness? And also, if the illness is somehow related to fo

How about using a dedicated paper notebook to log everything that comes to your mind related to this illness? And also, if the illness is somehow related to food/habits, more or less, then that could also be tracked - like what you're eating and how your body responded afterwards (I mean, within, let's say, 24 hours).