Could drugs like Ivermectin and HCQ or other drugs help cure
the disease if it is caused by parasites?

The root cause of disease in human beings is parasitic infection. ALL DISEASE - INCLUDING CANCER.

Ivermectin is a powerful parasiticide. Get rid of the parasites, get rid of the disease.

Oh, and you cannot overdose. But what WILL happen with large doses is something called “herzing” - the parasites are being driven out quickly and they congregate in areas like extremities (fingers, toes, etc) and as they do, it can cause discomfort. Some people even experience TEMPORARY impact to their vision (this would be evidence that their eyes had parasitic infection).

(FYI - ivermectin is a fungus. It is a naturally occurring fungus on grass or other plants; ever see your dog or cat eat grass? They are getting a God-given anti-parastic medicine when they do this. It is medicinal.