I cry for no reason sometimes too. For me, I think it is a way for my body to release it's stress. I've learned to let it happen. I cry, I feel better sometimes and move on. Or, I cry and come here to chat, post, or call a friend. I know how you feel about nothing gets better. I don't have any answers - all I can say is that you are not alone. Coming to this site and reading helps me. I hope it helps you too.
You are not alone.
Peace