a bit worried im 34 i went to the toilet about 2 days ago to find my poo had gone a dark black with a greenish coulour to it my stomach feels a bit different like its got a tight band round it and today i bent down and felt a little pain i dont take iron tablets and haven,t eaten any thing dark recently looked it up on computer it said somthing about gastrics and ulcers has any body experienced coulourchange in there poo and if so what was it really bothering me an a little worried.