DK, welcome to the forum.
I'm very sorry for your losses. I don't think I'm able to grasp the pain and loss you and your wife may be going through, but as the father of an awesome 18-year old child, I certanly know the kind of nightmares the mere thought of it brings up. Hang in there, your wife needs you.
You're not really in a position to drop out suddenly, but your wife is certainly a good excuse for you to start relinquishing some organizational "privileges" that are burdening you - you need to support her and focus on her needs. And take it VERY slowly. Be considerative of your wife's feelings about you slowing down your activity in the congregation, as she may take it as a double loss, and even feel guilty about it. You need to make sure she doesn't get that feeling. Spend a lot of time with her, maybe plant a few seeds of TTATT here and there, but, above all, let her see that the congregation isn't the spiritual paradise that the GB wants the JWs to believe they live in is nothing but vaporware, that when problems arise and you appear to be weakening, they turn against you.
All my words couldn't really persuade my wife, but it was the unloving, unchristian tratment that I got from the congregation and JW friends when I began to express doubts and dissent that caused her to finally join me in leaving this disgusting cult.
In any case, now it's the time to read read read, strenghten your ideas, and take your time to think about an exit strategy that will leave your marriage intact.
Eden