<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been feeling very tired lately and my stools are looking different than usual. Also, I vomited blood once and noticed black, tarry poop in the toilet. Ive also noticed that Im losing more hair than usual. Whats wrong with me?  <response>: It seems like you have anemia. Its a condition where you have a low red blood cell count, which can cause fatigue and changes in stool appearance. Vomiting blood, black stools that look like tar, and hair loss are also symptoms of anemia. 