I know how you feel and I would like to help you, but I am not sure if there is any help from outside. You have to fight with your self. It is not the world being against you - I am not against you, I understand you - it is your mind playing tricks on you. It is your thoughts and your image of the world that you created and you believe in. You (and me and many others) are in a whirl takings us down. If you believe that others do not care about you and you turn away from them, others will turn away from you, because they see you the same way as you see yourself. We have to change ourselves our attitude our believes to get into calm waters again. If I have such moments when I feel down I go outside for a walk, bike ride or do something to occupy my mind to change the direction of my thoughts. I walk or ride until I am exhauseted and then I can sleep better. I stopped eating sugar, drinking coffee and try to eat healthy food. It is hepling me, but still I have to be on the watch all the time, the mind is unpreidictable. I want to learn meditation to get more control over my mind.
Others may have different opinoin, I just want to telll you that you are not alone in this suffering and that we have to fight. We can't change the world, we have to change ourselves to survive.