If your school is not willing to accommodate you, then perhaps it is time to look for a school that will. I can't remember the exact name, but I came across one school that allowed their students to go part time if needed, and allowed students to spread out their program to as long as 5 years. I believe the school was Springfield in MA( I could be wrong though so don't quote me on this). If you're gpa ain't bad(meaning you are in good standing), it wouldn't hurt to call these schools. Something to think about: it's better to fight for an accommodation irregardless of your professor's opinions of you and still get your degree and graduate, then to not fight and risk failing out of your program because you couldn't handle it.