The region you describe to the left of the navel is well known to naturalists as a favorite worm haven. Cayenne is one of few herbs that maintains its potentcy throughout the whole digestive tract. You would probably do equally well with macerated garlic.
Cayenne is a great anthelminth. Keep on it daily and then take some breaks in between.
Tequila chaser won't hurt either. Agave (tequila) saponins can get at liver flukes. There is a whole class of saponins that can kill flukes.
Another natural as good or better than papaya is horseradish. You can get the cheapo horseradish paste in supermarkets and use as much as you can stand with meals.