While this is an extreme depiction (probably intentional), it reveals a truth the medical establishment largely ignores.

Parasites are extremely common in humans and animals, in all geographical regions, and they do cause an array of health conditions that go largely undiagnosed OR misdiagnosed.

Additional clips and resources in the replies.

If you're wondering how to get Ivermectin and Praziquantel easily;

Horse paste - Amazon dot com (Horse Anti-parasitic paste)