I don't know if this fic can speak to you on the same level as it did to me.
It was an emotional rollercoaster and sometimes, way too personal.
I advise you to read not because it has TSN characters in it but because this story can touch in a way you're not comfortable with and this is what reading is about, being affected by it.

Title: You Could Dress This Wound
Author: myownremedy
Pairing: Mark/Eduardo
Length: 31,719 words
Rating: NC-17
Summary: The one where Mark wakes up and discovers he can see other people’s pain as light.

Link to fic.