David Sutton has 3 books (well many) the beis HaLevi on Bitachon,
And daily dose of Bitachon as well as daily dose of pesukim on Bitachon. The pesukim is better. He has a daily Bitachon newsletter that anyone who has email can sign up for on ITorah.com to get a taste. Granted the books are way better but I take a lot from the newsletter when I need instant chizuk.
