It is good that you have decided to give up tobacco and alcohol. With a good balanced diet and regular exercise, you can definitely improve your health. But there is no particular food item/diet which specifically treats appendicitis
. If you have been diagnosed with appendicitis, the best treatment is surgery. For kidney
stones, take lots of water and avoid being dehydrated. Again do get yourself evaluated by a doctor rather than trying to treat yourself as kidney stones, if untreated, may have a bad effect on your kidney function in the long run.
Hope this has been of help. Best wishes.