The phobia of phobias is Phobophobia.
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
Honestly, you can have a phobia of anything! There is even a fear of phobias!
phobias are just natural things we have and noone can stop that
Generally speaking, yes, phobias can lead to compulsive disorder. Still, it depends on the severeness of the phobias.
Specific phobias can happen at any age
You get phobias whenever you get scared of something. Thats what a phobia is, when you have a fear for something.
Phobias - 2006 is rated/received certificates of: UK:PG
Phobias can be diagnosed as a disorder themselves, but disorders such as Panic Disorder, Generalized Anxiety Disorder, and PTSD are all often associated with phobias.
There is hundreds of phobias, too many to list here. Try looking on the Internet for a complete list. I believe 99.9% of the phobias are not in use, they are just there to exist.
To get information on different phobias for yourself the best resource would be a psychiatrist. A reading option for phobias would be medical journals from the library.