<human>: Could you distill the essence of the text into 1-3 sentences?

I have made a HUGE mistake that will likely have big repercussions in my life.  I am in graduate school and failed a class last year, which meant I had to retake it this semester and graduate a year later.  The first assignment of the class was due this morning online, but I somehow completely forgot to do it and never saw the reminders I set for myself.  This assignment is worth a ridiculous amount of points--like 70% of the grade in the class--so not completing it means I will fail the class again and be kicked out of the program.

I e-mailed my professor as soon as I realized (about 20 minutes after the assignment closed) asking if I could please be allowed to do the assignment, but I haven't heard back from them yet.  I am on the verge of having a panic attack, but I have to keep my shit together because I am going to a professional conference today.

I realize that I probably already used up all of my goodwill with this professor when I failed the class last spring, and I feel that it is unlikely that another exception will be made for me.  I am facing the prospect of failing out of my program for such a STUPID mistake on my part, and it is making feel absolutely hopeless and helpless.
<bot>: I made a huge mistake that could alter the course of my life forever, and I need help figuring out how to deal with not knowing what will happen, and/or the consequences when I do find out.