I have lost 14 pounds since july. Wheat allergy and hiatel hernia. I am concerned?

Weight loss. Hiatal hernia should not be associated with significant weight loss. It is usually assoc with reflux. Wheat allergy may be associated with diarrhea that can lead to some weight loss especially when you are not eating carbs.
See doctor. This kind of unintentional weight loss should be evaluated by a physician who is able to get a comprehensive history and physical exam on you. If you need further testing, this doctor will then have the information necessary to make decisions. Best wishes.