<s>[INST] Was not sick.  Normal and active healthy appetite got a root canal infection. Prescribed pen VK on Jan 3. 500mg 4 Ca a day. During this 7 days antibiotic bout was only able to eat small amounts of soft foods due to swelling and pain. Tooth removed on Jan 10. Have not regained appetite and feel really bad. Some stools are loose, others are formed and brown However sometimes when wiping paper look brownish yellow. I have only been eating yogurt, toast with honey, Farina cereal and very small amounts. How can u go from being so active and full of energy to not feeling well in such short time? [/INST] Hi. Thanks for the query. As per your complaint lack of appetite and brown yellow stools after intake of antibiotics can be due to probably Clostridium Difficile infection that can occur due to disturbance in the normal bacterial flora of intestines leading to Infection caused by Clostridium bacteria. You should consult a Gastroenterologist and get evaluated and a thorough clinical evaluation and investigation like blood test, occult stool test and Endoscopy can help in diagnosis and treatment can be done accordingly. In case of C. Diff you can be advised Metronidazole, fidoxamycin etc. along with plenty of Probiotics like Yogurt and taking ample of fluids and light diet. Hope this information helps. Thanks and regards. Chat Doctor.  </s>