Hume finds himself in an appalling state during Treatise I iv 7 (the conclusion of Book I). He is almost bereft of beliefs; he believes, for a short time, only that he cannot believe anything else. But, being an assiduous student of human nature, Hume makes this extreme skeptical crisis into material for naturalistic study. He carefully reports how extreme skepticism comes about, what it is like, and how it passes. So I iv 7 has two aspects: involved personal experience of a skeptical crisis, and detached naturalistic reflection on that crisis. Interpreting the text correctly requires taking both these aspects seriously.
An old interpretive tradition ignores or downplays Hume's detached naturalistic reflections in I iv 7, and focuses only on his involved personal experience of skepticism. Oddly enough, interpretations in this tradition tend to treat Hume's experience dismissively and derisively.