What to do?

As of now I have interviewed with all the schools I applied to and am waiting for results... Change waiting to anxiously waiting for results. As if to break the monotony, I need to go to Japan as my client specifically asked me to come over. Now if ISB offers me a place then it will put me in a spot as I may not be able to come back before term starts.

I spoke to my boss regarding the situation, but he chose not to intervene. He knows that as a conscientious employee I will take care of my company's best interests and will go. But, all this causes a lot of turmoil, as I have worked extremely hard in the past year to prepare to go to B School this year.

What to do?