You basically answered your own question. Usually when your making a wish you already want something and if as you stated have a "strong wish" you are already obsessed to begin with. If you find this is an obsession that is overbearing you should really seek help for this.
If you are inlove with someone and hope and dream of having a date with this person then you are wishing, but when you stalk the person, write them notes, phone them and then hang up or don't leave your name then this is obsessive behavior. Obsession can happen in a career where enough is never enough or a rich person where they have agreat deal of money, but they are so obsessed they forget what life is about and just make more money. An obsession is when it takes up every waking moment of your time and your other attributes start failing.
To get over an obsession with a history teacher who doesn't even like you concentrate on your studies or change your school or subject.
bibliomania is an obsession of books
The answer depends on what you wish to change it to!
Yes
How does chillingworths original wish to see justice done change
Obsession is 5' 4".
if he has an obsession too. I really doubt it if its an obsession.
oxymania :(obsession for sharp objects) xiphimania (swords obsession)
une obsession (fem.)
it's the same - obsession
Obsession with calories could be a symptom of bulimia, but not necessarily obsession with cooking.