Where is God?

Right now I am facing a hard period in my spiritual life. I just returned after almost a 4 week long missiontrip to Zambia. It is a desert period, where it is all cloudy and foggy. I feel so empty, so left alone. In my human being I feel so lonely, it is like God has left me? I am just so angry at him. Why are we the lucky ones? Those who are not starving and living in poverty and suffering? Keep me in your prayers. Have you gone through the same kind of thing in your spiritual life?