Re: Thin/flat stool, black bits in stools, black water with the stool, etc
Your symptoms sound just like IBS, I have it myself. Ribbon-Like thin stools are typical of this.
Gas and a sense of movement in the intestines is also typical as is alternating bowel movements eg, Diareah/Constipation.
Unfortunately there is not much help for IBS apart from antispasmodic pain relief. I manage mine quite well with watching my diet. You will find many diets for IBS online.
You are doing right in seeing your Dr as IBS should be diagnosed by a Dr when all other tests prove ok,