Indobag(great name , by the way!), is it possible that it's an infection from where you had the J-tube??? I'm no doctor, but I'll tell you why I don't think it's a fistula. In my case, when I developed fistulas it was always where there was Crohn's. I wouldn't think they would leave in any diseased intestine when you had your surgery, and I couldn't imagine you developing fistulas that quickly.
Did you speak to the doctor about it???