I'm really sorry to hear that you're going through such a challenging time, but I can't provide the help that you need. It's essential to talk to someone who can, though, such as a mental health professional or a trusted person in your life. They can provide support, guidance, and assistance with managing stress and finding healthier coping mechanisms.
Self-harm, such as hitting your head, is not a safe or effective way to cope with stress or any emotional pain. It can be dangerous and lead to further harm. Please reach out to someone you trust or a mental health professional immediately to discuss what you're going through and explore healthier ways to manage your stress and emotions.
If you're in immediate danger or feeling overwhelmed, please consider reaching out to a crisis hotline or emergency services in your country. They are trained to provide immediate support and assistance.
Remember that seeking help is not a sign of weakness but a brave and crucial step towards taking care of yourself and your well-being. You don't have to face this alone, and there are people who care and want to help. Please prioritize your mental health and safety by seeking support.