Hi A Question From The Netherlands. Do I Need To

Hi a question from the netherlands. Do I need to sorry if my stool has different colors as in light brown with darker brown parts ? I have been having bowel problems for months now nothing found except for lactosis intolerance and a parasite (dientamoeba fragilis) doctors see no need for treatment or checking for blood in stool . What can you advise me? I don't feel well and energetic as i feel normally