I have been troubled. I can't put words to it, sometimes it just happens. The journey of our hearts is sometimes wrought with valleys, arrows, and all kind of things that seek to discourage us. I read a devotional I receive from Ransomed Heart, put out by John Eldredge a few days ago. I was drawn back to it a few minutes ago. I would encourage you to sign up for them, they are very insightful and if you have not read any of his books I would urge you to do. I think in our busy world it is too easy to neglect our hearts.
"The heart is central. That I would even need to remind you of this only shows how far we have fallen from the life we were meant to live - or how powerful the spell has been. The subject of the heart is addressed in the Bible more than any other topic - more than "works" or "serve," more than "believe" or "obey," more than money and even more than worship. Maybe God knows something we've forgotten. But of course - all those other things are matter of the heart. Consider but a few passages:"
Love the LORD your God with all your heart and with all your soul and with all your strength. (Deut.6:5) [Jesus called this the greatest of all command-ments - and notice that the heart comes first.]
Man looks at the outward appearance, but the LORD looks at the heart. (Sam. 16:7)
Where your treasure is, there your heart will be also. (Luke 12:34)
Trust in the LORD with all your heart, and lean not on your own understanding. (Prov. 3:5)
Your word I have treasured in my heart, that I may not sin against You. (Ps. 119:11 NASB)
These people honor me with their lips, but their hearts are far from me. (Matt 15:8)
For the eyes of the LORD range throughout the earth to strengthen those whose hearts are fully committed to him (2 Chron. 16:9)
Taken from Waking the Dead, 39-40 by John Eldredge
Blessings to you all.