I might be fixated on it because it’s been a recent problem. I could be trying to render my problem literary as opposed to clinical to change its balance so it rests more comfortably in my hand. I am comfortable with metaphors. I could be trying to emphasize the extent of the problem, and maybe I’m trying to find a way draw attention or sympathy that is more dignified or more subtle than, I was ill and my illness damaged my ability to remember and think.
It may also be a way to guard against the real, clinical consequences of describing oneself as ill – especially (arguably) mentally ill. This is a way of strengthening the impression – and describing the severity of a subtle problem – without resorting to clinical language that might implicate me as mentally ill.
I may also be trying to demonstrate clarity – by displaying eloquence, acknowledging the extent of the deficit, and contrasting it with my current alacrity.