<s>[INST] Hello doctor i feel i have a huge problem iam male 19 years old 5 feet 9 inches and only weigh 110 pounds. I eat normally 3 meals a day few snacks hear and there but i dont gain weight. I lose a lot of hair and have a very very hard time sleeping i find myself thinking to much. I believe i might be stressed and even have ADD. Can you please help with any suggestions. [/INST] Hi, You have to rule out hyperthyroid by serum TSH estimation. If it comes normal than stress or anxiety indices hair fall and weight loss can be possible. You can Consult a nearby psychiatrist for detailed evaluation and behavioral counseling. Antianxiety medication like alprazolam or clonazepam also can be prescribed. Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor.  </s>