I strongly suggest you cancel your operation. For one thing this does not prevent any future gall stones and they will remain in your liver thus enlarging it. I took over 500 gall stones out of one women who had her gall bladder removed ten years ago. She had an enlarged liver and was very overweight including a prolaspe stomach. The cleanse used was three tbs Epson salt in a glass of water drunk one hour before drinking 5 cups fifteen minutes apart of 3 tbs unrefined olive oil mixed with 2 tbs lemon juice and water. Use a straw to bypass the taste buds and a little maple syrup to sweeten the mouth when drinking mix. Should you vomit, then continue with the cups left. Should this happen on the last cup, drink another cup. If you are underweight or very skinny, 3 to 4 cups will suffice. Do this before retiring for the night and by next morning be prepared to count the stones preferable in the bath tub where you can see them.