Find something, anything positive to focus on. Then continue to focus on that positive thing. If your mind wonders to something negative, bring your focus back to the positive thing. Perhaps you are focusing on a recurring set of negative thoughts? Reprogram your self with positive thought and you will will your self into a different set of feelings. I've been through something similar, and there are many things to do. I didn't like the thought of seeing a counselor, but having found good genuine help I wish I had started sooner. I like being in the sun, eating fresh fruit, and going out on walks. The basics can help. If this sounds silly, try it and find something that works for you. There are so many helpful posts others have commented. If nothing else helps, ask God to help you? You are more precious than this world.