Ashi-
This is such a tough time for you and your wife - I think most of us here understand that. All I can say is It does get better.
The idea of going back to school is a great one. While part of the org I felt like that wasnt really an option. You know the old "if you time for school you should have more time for service". Now I take one class at a time (slow I know) and hope to take on more as time progresses. I'm still learning to embrace the things that were not encouraged as a witness. College, vacations without guilt over missed meetings, making friends with anyone I choose, humming Christmas songs without fear of being overheard.
The idea that Mrs. anxiety is due to "leaving Jehovah behind" is far fetched. It's the people we leave behind that hurt us. It's the loss of those Human relationships that we mourn. In my case, the last entity I feared when leaving was Jah. I figured, if he's really there and can see into my soul - he knows how this decision kills me and that I completely believe it to be right - hell, I prayed about it and here I am.
Good luck, let your wife know that it's ok to grieve and that she's not alone.