I feel very sad and i don't know what to do, what should i do?

Get help: I think that you need to get checked out! you would benefit from talking about what you are going through with a therapist, psychologist or comprehensive psychiatrist. I just want you to know that there is help out there and you can get better. Stay safe!

Agree w Dr. Tapia: How about talking therapy (such as cognitive behavioral therapy or insight oriented psychotherapy). Don't isolate. Spend time w people. Use your support system. Get out. Don’t stagnate at home. Get at least 8 hours of sleep per night ; eat healthfully. Daily aerobic physical activity is a big +. Try acupuncture, tai chi, qi gong, yoga or meditation.