I can imagine asking a friend to do it for me, though it's terrifying

Terrifying? That's troubling. A shrink can definitely help you!

Also, I doubt the thing modafinil boosts is the same thing I lack, but it could help, if only through placebo effect.

It may boost everything just enough to get you over the line.

Good luck getting something done. I hope something works for you. Do whatever it takes.