you ask whether your misery is due to this crush, or your original problems. I think that is the key.
I read the following about sexual obsession over a person. Think of it this way, if you have a very profound problem that's related to your personality and approach to life, or your past, your family or even just the condition of being human it's difficult to know where to start. It's maybe very unerving to face, maybe you just don't know how. There's tremendous anxiety so your mind creates this distraction, this very concrete and tangible thing which takes up all your thoughts, all your energies, and all your emotions. Then your days are filled with petty thoughts, like the look he gave you, what he said, what he might have meant. It's like being filled with rubbish. Yet of course the real problem is not tackled so there's the constant feeling of disatisfaction, but the rubbish gives you something to rummage in, and you even get other people, like us on this forum, to rummage with you.
Now I don't know if this is applicable to your case. It could be that this person is so wonderful that he is worth a year or more of your obsessing, maybe it's just hard getting over a crush. From my experience however I'd say letting someone hold such a central position in your life for that amount of time is a form of idolatry, and you should ask yourself: what would you be thinking about if you weren't thinking about him?