Is it normal to have 4-year long obsession with an anime character

Aspergians have proven intense interests, so please consider my feelings here. I'm an adult trying to cope with this.

Four years ago when my obsession began, I felt this intense interest continue to grow stronger and more powerful. It influences me to this day and to such a degree that I can barely focus on my every day life.

I am interested in an anime character, in love with him in fact. But people are losing interest in the fandom, moving on, and I'm left wondering how I am supposed to continue my life.

The only way to keep this obsession from taking control of me is through someone role-playing him for me (if you're a role-player then it should make more sense to you what keeps me at ease).

Should I go too long without role-playing with someone who takes on the role of this character I start becoming a rampaging tyrant. I become moody, begin noticing my signs of stress, and at times even feel overpowered (like something is on my back trying to hold me down).

I've tried fan fiction, fan art, self-taught meditation (and failed horribly), letting it wear off (it's becoming stronger), falling in love with a real man (done and it didn't work), watching the series he's in, and methods to learn how to control my dreams. I've tried keeping myself busy (doesn't work either), research on the subject, etc etc. Other things I've tried are attempting to become obsessed with something else (or at least more modern) and trying to ignore it until it goes way (it becomes even more overbearing).

Is there anything but the aforementioned solution that I can try? Is there anything that I haven't tried that might work? Is this normal? Will it go away? How much longer should I wait?

I'm going to try therapy starting at my next session, but my case so far proves to be abnormal. I want to know what you guys think.

Secondly, I'm better functioning as long as I've role-played with a role-player of him for an extensive period of time. Without my "fix" my ability to function gradually declines, and at times I will notice I have trouble breathing.