I think that sometimes when we go there in our heads, it's because we are looking for the feeling of the escape. The escape from our everyday lives, from the humdrum stuff.
My IC at the time told me it wasn't OM that I missed, it was the feelings that the A elicited in me.
After everything, I realized that the everyday stuff was the good stuff, that you can make happiness anywhere in any situation.
I replaced the A activities and high with positive behaviors and attitudes in my everyday 'real' life. Those are the things that sustain me now.
So...is there anything going on with you that you think you need to be looking at? Anything that's going on that you're dissatisfied with or unhappy about and the thoughts of OW are your default thought process? You need to mindfully go back to your healthy thought processes, and not use thoughts of OW for the escape.