There is no name that I have heard, perhaps no official name at all, perhaps no recorded instance. Perhaps toilettopapyrophobia or aquaschrankopapyrophobia are suggestions.
The study of phobias is called phobology or phobology. It involves researching different types of phobias, their causes, symptoms, and treatments to better understand and address them.
The phobia of clowns is called Coulrophobia.
Extreme fears are called phobias. Irrational fears are called irrational fears.
In Urdu, toilet is called as Pa-Khana (پاخانھ).
Leporiphobia.Almost all phobias can be overcome by desensitization therapy. You can do this.
Yes, there is even a fear of a duck watching you. But these are called phobias
The phobia of phobias is Phobophobia.
Phobias are unrealistic fears, actually.
The link below a lists of all different phobias from A to Z. There is a site called Phobialist that has a long list of phobias that people can suffer from. The website Fearintofreedom also has a list as well as information about overcoming phobias.
The name of the float mechanism in a toilet is called a ball and cock.
Phobias are an aspect of psychology, which is considered a science. So yes, phobias are a science of sorts
Freud said phobias were repressed conflicts, were as Watson said that phobias were learned