I lost 4 kegs in aweek because of stress and anxiety, i can't control it and i think i'm underweight, it's the 3rd week to lose weight, what can i do?

Get professional: Help for your anxiety/ stress. Encourage you to see a psychiatrist or a psychologist. Talking therapy ranks really high. Cognitive behavioral therapy can be quite effective. Aim for daily exercise, 8 hours of sleep per night ; good nutrition with 5 servings of veggies ; 4 of fruit per day. Try tai chi, yoga, qi gong, progressive muscle relaxation, deep breathing exercises ; meditation.