im gonna do some guessing again. i have the feeling that you have an extreme yetzer horah to lust and fantasize. i dont think you suffer from addiction, as you yourself questioned. the root of "i want nothing but You" is used for one of 2 things. either its an extremely high madreiga in dveikus (i think the baal hatanya said it on yom kippur), which im assuming we are not holding by, or its a method used by addicts who are desperate and realize that they are out of control, so their only root to stay sane and not fall is to surrender to Hashem.
i know i may get killed for this, but i think this mehalech is dangerous for a non addict. its the road from desperation to giving up. this leads to justification... ill stop here. again, i might have not understood what you were saying but this is my assumption.
i think that you should stay away from that root, and realize that you have the ability to pull yourself out of your matzav and live a normal life. i dont know you enough to give ideas, but maybe you should find something in yourself that gives you sipuk and satisfaction, and make it part of your life. for example, if you enjoy music and think you can compose, learn how to do it and let your mind occupy itself with that. whatever, im rambling but you get the idea.
again i might get killed for this, but marriage may be a big help for you if it helps you settle down and focus on real life. Hatzlacha!!