As others have said, a lot of us can understand what you are going through.
One of my daughters was like that, she just screamed for no reason. Are you sure that she is not hungry. If not have you considered that she might be colicky. I gave my daughter a fennel drink and also some gripe water and that really seemed to calm her down. She could be gulping down a lot of air when having her milk and it is giving her a tummy ache.