What's in the head???

What is in my head? I cannot think or focus on anything right now. I cannot sleep soundly at night, then I feel tired in the daytime. Funny thing is I sleep well and deep in the daytime. When I go to bed at night, my mind is always thinking of things, anything. It is just so busy with thoughts. I cannot zoom into anything. I am not interested in anything. I just do my housework each day and then log in to my facebook. What is going on in my head???