unhappy returns

One of the challenges of tapering off benzos is the separate issues that were there pre-benzos and reassert themselves as you heal from benzos. As David Powers says, benzos aren't like antibiotics. They don't treat anxiety and depression. So, as you become less reliant on them, and you heal in that way, your mental health issues seem to reappear. 

This is really relevant towards the end of your taper, and beyond that. Early on, you're going through hell but it's benzo hell. Then, as you heal and you expect to feel so much better, suddenly you're struggling worse than ever. Before, the challenges of benzo withdrawal were more immediate, but now, as those challenges recede, your pre-existing issues come into play again. It doesn't mean you're not healing and making progress.