I have the same problem. I too
pine for something, and it's very most likely NOT going to happen. Sometimes the obsession clouds special moments with my family or husband, and I hate that! (Like, "Oh, if only this -the obsession- had happened, this moment would be perfect.") I have low and high levels of this particular obsession, so during the low ones, I remind myself that I
am present during special moments, and
enjoying them very much, so don't forget that when the high level obsessing starts.
I get along best when I get distracted from it. But it always resurfaces. I used to obsess about random things, like a certain artist, or a book, or even jewelry. Then came this obsession with an occurence that I wanted -
needed so badly. I've not really gotten successful help from either my tdoc or pdoc, though both have tried. It seems to be my cross to bear...
I've actually prayed about this a lot. And I know God wouldn't allow it, but for some greater purpose.
If possible, try to become absorbed in a productive or harmless hobby or activity. That's been my best way to deal with it. Also, having a large family to care for
I take lithium BTW, 900mg/day. It's my fave med so far...
obsessive thinking - bp ? 
