I've been having flat poop for about 6 months now.its usually of diarrhea consistency.i don't have the best diet.added fiberno change.how can i stop i?

The shape of: your stool suggests SPASM of your lower bowel. Certainly this was always thought to be a major symptom of what WAS called "spastic colon" , now we recognize an entity called "IBS or Irritable Bowel Syndrome. You need to see your Primary Care Provider who can decide whether a consultation with a Gastroenterologist is necessary! Hope this helps! Dr Z