<s>[INST] have had left sided chest pain and heartburn for over year, take lansoprozole daily. Also skin in the inside of mouths is peeling away when I dont take the lansoprozole. I also have blood in my stool on a regular basis, feel dizzy at times is this just indigestion. [/INST] HelloWelcome to Chat Doctor. Going by your symptoms, it looks like you have got gastroesophageal reflux disease. Laos because of peeling from inside of mouth and persistent gastritis, I suspect you it B12 levels should be low. It B12 deficiency can cause mouth ulcers and acidity like symptoms. It also causes anemia. Also since you have blood in your stools, it is necessary to evaluate that. Blood in feces may be due to piles, fistula, constipation or intestinal bleed or abnormal growth. You must consult a gastroenterologist to get evaluated for blood in stools. You should also do a CBC and it B12 levels to check whether it B12 is low and presence of anemiaTreatment can be started on basis of above reports. Meanwhile, continue taking lansoprazole. Wishing you good health. Regards </s>