For pinworms, You need to change underwear, bed linens and towels EVERY DAY. No sharing of washcloths. Treat the whole family. Try diatomaceous earth for the eggs. Start with 1/2 tsp and work your way up to 1 tablespoon/day. Make sure it is FOOD GRADE. Mix in water and drink on an empty stomach every day for months. Do not be surprised if other parasites show up in your stool when using the diatomaceous earth. You will have to look for them in your stools.
Repeat the pin worm meds every month for many months. Time it with the full moon. Do it for at least 2-3 months after all symptoms are gone. Some recommend that you continue the treatment for a full year.