Blurry Vision

Something has been bugging my mind recently...though most of the time I am still a happy person as I always be, the miserable moment will still find it's chance to creep into my mood. If someone is sensitive enough, they should have sense my moment of quietness. At times, I will question myself what is the thing that I really want down from my heart, but everything is kind of blurry now. What do I do? I am not sure how long I can keep this to myself...it's really difficult to hold it on...