my wife is 29 week pregnant she is having severe pain in chest n back . done sonography we found gallbladder stone plz suggest how can we control that pain its difficult to breath her in pain

You must discuss this with your gynaecologist as they will be able to suggest a suitable course of action. In the meanwhile make sure she avoids all oily and spicy foods as they trigger the pains caused by gall bladder stones. This is not a cure just management and the doctor must be consulted.