There is a difference between imperviousness and strength

That's the only strategy that might work. One step at a time! Struggling with the pain little by little. Not trying to fix everything at once. It's like training. You have to start from doable and increase weight and repetitions day by day. At first, you have to repeat tens of times to "get up! dress up! and show up for life," to force yourself to get back to life. Even then, it won't be fun at all. You won't be efficient and life sucks so much.

Second day, you get out of your room an hour earlier, you have dreamt about matrices all night long and a friend sends you an email with some slides you've been looking for. You get happy! Pandora brings back the song you've been listening to the past few months. Life sucks!

Third day, there's gonna be a meeting and you will argue with some people for a whole hour. You're distracted. 

Fourth day, you might finally be over with this shitty abstract. You miss what you never had and life sucks!

Fifth day, all you think about is a Jacobian! Still, you have no appetite!

Sixth day...