I have searched the forums when i died in far into fatigued water and found no answer so i am sharing my experience with you in hopes of helping people avoid the potentially massive repair bills that go with dying and spirit ressing because of this.
I am aware some people probably already know this but as this site didn't hold the answer, just an old post with no real useful information.
(I flew south from Dalaran and alt+tab watched youtube and ended up just above the 2nd N in the Northrend world map)
1. The way to retreive your body is to go out to JUST outside the fatigued area and die again as a ghost.
2. Walk back to the border of fatigued place where you died as a ghost. You should see your body but not be able to res (no option to res appears).
3. Log off to character screen.
4. Log back in.
5. Accept res.
Hope that helps people in my situation.