I find poetry books can help me in difficult times. Just browsing through a book and finding one poem that speaks to me and expresses what i feel and cannot say makes me feel less alone and more connected to the world. Also, when my concentration is not good, I can just chose one short poem of a few lines and that is enough.
We Have Come Through: 100 Poems celebrating courage in overcoming depression and tragedy.
I have found this poetry book very inspiring, offering insight into despair and difficult emotions and also hope and solace. It was published to celebrate the 10th anniversary of Survivor's Poetry (which is a network of writers groups for people who have suffered mental distress), and has a few poems written by members, as well as more famous poets of past and present.
http://www.amazon.co.uk/Have-Come-Through-Celebrating-Overcoming/dp/1852246197Staying Alive: real poems for unreal times
This is another anthology, with contemporary poems that are powerful, emotive and life-affirming, from a variety of international poets on themes such as life and death, love and loss, journeys, war and peace, body and soul.
http://www.amazon.co.uk/Staying-Alive-Poems-Unreal-Times/dp/1852245883