Whats the symptoms of fistula or fissure?

Completely different. A fissure is a tear. They bleed, and can be very painful. A fistula is an abnormal connection from the bowel to another organ, viscus, or the skin. The common types are between the trachea and esophagus, the rectum and the vagina or bladder, or the colon and the skin. They are generally in the setting of either surgery and post operative care or infection, like diverticulitis.