So you got a PASS and you're trying to get your grade changed to an HONORS.
Every single academic I've ever met would see right through this petition for the grade grubbing it really is. Given the large volume of impassioned emails and letters and tearful students who go through their offices on a regular basis, who would blame them for being unsympathetic?
Honestly, it is probably easier to get a FAIL changed to a PASS than it is to get a PASS changed to HONORS. At least a failing grade merits some sympathy for your plight.
Chill, just do the best you can, let the chips fall where they may. I'm guessing you think this PASS grade is ruining your future career. That's ridiculous, and looking at it from the other side all your stress and anxiety is for nothing. You passed, and that's what matters. The rest isn't going to make a hair of difference for your future plans.