even if u go for a medical checkup, the Dr wont immediately put u on endoscopy la...urine test will be requested first of all to check whether theres red blood cells in your urine under the microscope since you mentioned that your urine is pinkish in colour.
stop eatin dragon fruit for time being and see whether your condition is still the same or not. If it is still the same, reddish stool and urine, you better go check la...