Hello, I am extremely stressed about my situation and I'm not sure what to do so any help would be appreciated.

So I took a directed studies course with my supervisor. It seems that he missed the deadline of the submission and now he refused to submit my grade, so the mark appears as a zero on my transcript. I am in my final stretch of my master's degree and now I am one credit short of graduating. For the course i wrote a 20 paged report and i managed to generate a publication. So now I feel like i am out of options.
It's too late to change supervisors and I am no longer on track to graduate. If I do decide to take a course to make up for the credits, I will be over worked for the semester and I'm not sure i can meet the target graduation deadline. Due to my financial situation , I will not be able to continue my education. I have been trying to get a meeting with him for the last 3 months with no success.

Does anyone know how I can resolve this issue ? The stress has gotten to me and I have not been able to sleep and in turn work and i fear that this is going to get worst. Seeing as we are still on holiday hours, I cannot reach anyone in administration until the 6th.