A loss can bring on a variety of emotions and one of them can be sadness.  David expressed his grief and sadness to the Lord through out the Psalms.

“How long must I wrestle with my thoughts and day after day have sorrow in my heart? How long will my enemy triumph over me? But I trust in your unfailing love; my heart rejoices in your salvation. I will sing the Lord’s praise, for he has been good to me. Psalms 13:2, 5-6

You can overcome the overwhelming feelings of sadness by trusting the Lord, rejoicing and praising Him. Praise increases our joy.