Suggest Treatments For Chronic Bloody Stools

I am 39 years house wife. For the last two year, blood and mucous discharge observed in my stool. For few days it is Ok but again it starts . I have done,Ultrsonography,Clonoscopy,Endoscopy but all reports are normal. I am also restricted my diet to no spicy food, No meat or chicken, Very less oil. but still the problem persist. Before discharge I have pain in m lower abdomen. I have shown to many doctores ,some suggested Ulcer , Some told IBD,IBS and I have taken lot of medicine but still , it has not cured permanently. My periods are normal.Please suggest what is the exact problem and what to do next as I am loosing weight and mentally very upset.