I Have Had Pain, Gas, Diahirra, Loose Stools, Weird Looking

I have had pain, gas, diahirra, loose stools, weird looking stuff coming out since Christmas. I have taken Imodian to stop the symtoms but that has only worked a bit. Have tried a mild diet but nothing has stopped the pain, gas and urge to go to the bathroom but nothing comes out but pieces of a bowel movement and this weird looking stuff