A short, direct book on worry: John MacArthur's answer is to replace anxiety with prayer, right thinking and action. 96 pages. Read more.
How do I let go of worry and anxiety? John MacArthur takes the question head-on in this short book, drawing on the biblical texts that address it most directly and setting out principles for handling uncertainty, confronting worry and finding freedom from the kind of anxiety that colors everything else. The key to worry-free living, as he puts it, is to replace worry with prayer, right thinking and action.
At 96 pages this is deliberately brief, which is part of its usefulness: it can be read in one or two sittings by someone who has no appetite for a long book at the moment, and it is short enough to give away. Part of MacArthur's Found series from David C. Cook, alongside Found: God's Will and Found: God's Wisdom, and suited to a reader looking for the biblical material on the subject stated plainly.