Yes.The gall stones
can result in weight loss
Repeated attacks of pain associated with vomiting result in less appetite and also the fear of attack makes you eat less.Eating less results in a sustained weight loss over time.
However you must get your sugar levels checked as uncontrolled diabetes
may also result in gradual weight loss.
You must consult a surgeon and opt for a laparoscopic cholecystectomy
This shall get rid you of your gall stones as well as your symptoms.