HI THERE black stools point towards you having a gastric ulcer which might have mild to moderate amount of bleeding which comes out as black stools . it is very important that you avoid spicy food at any cost and also continue to take pan 40 mg twice a day before food. consume a bland diet, avoid tea coffee, carbonated drinks, alcohol, smoking. at this juncture an upper gi endoscopy to know the severity of the ulcer is useful and a visit to the gastroenterologist is rewarding. if the number of black stools increase and if you ever feel dizzy immediately consult the doctor.