Hi ! You have not mentioned whether your stool got tested or not for ova/cyst
. It does not look like a case of appendicitis
as the pain is more on the left. It goes more towards chronic collitis may be an amoebic collitis. In that case a course of Metronidazole
might solve the problem. But consult your doctor before starting on the drug.
Sometimes, a diet very much rich in fat may also give rise to such characteristics in the stool. I would suggest you to modify your dietary habits towards more of roughage and liquids and see if that helps.
Iron ingestion may give rise to slight blackish discolouration of the stool, but it should go away once it is off.
You are advised to consult a gastro-enterologist in person who can clinically examine you, and may advise on some specialised investigations to arrive at a conclusion.
Hope this helps you.