low again

to God belongs all glory and praise.. how do I begin to describe the low mood I am feeling? it is like an unmeasurable sadness that weighs on my mind. it feels like the weight of the world is on my head..I just want to cry at times and in other times I want to curl and hide away almost like ceasing to exist..I dont know why but it catches me unawares.. like today again.. I think I got some news or impending news at work and I just drowned again.. but to thee O Lord I find my strenght as I ask thee for help to lift me above these sinking feelings..Great O Lord is thy power and Great is thy dominion over all things