I need to increase my weight my bmi is 15.3 am in 19 pls help me dr.

BMI 15.3: Please see your doctor to make sure that there is no clinical condition causing this. If that is the case have your doctor refer you to a dietitian.

Need to see doctor.: I usually like to provide concrete answers to questions here, but your query requires some definitive testing. There could be many metabolic, infectious, nutritional, gastrointestinal, endocrine issues causing the problem with your weight. Your BMI is dangerously low. You need to initiate a local work-up with a doctor right away. Please.