Welcome to the forum. I know of several people that have woken up about the WTS whilst missionaries or pioneering overseas. I have posted an article about how illogical it is to believe only members of one religion will be saved at http://www.jwfacts.com/index_files/salvation.htm. It is nothing more than a powerplaying method of control.
I had a similar thing happen as you are waiting for. A shepherding call. I had determined to say nothing, knew it would be better to fade. But then the MS asked what I most looked forward to in the New System. I couldn't help myself and blurted out "I don't believe in the New System." That was the beginning of the end. However, I have to admit, after spending 10 years pretending to believe and growing more and more depressed, being disfellowshipped was like the weight of the world lifted off my shoulder. It is terribly painful loosing all your loved ones, but being true to oneself is far more important and liberating than living a lie.
The next couple of years are likely to be terribly emotional for you, but you will get through it. Use everyone on this board for support as it really will help get you through the bad times.