Hey, that sounds awful. Did you let anyone know that you stuttered before hand, does your college not have a disability department? Thats what I did when I had to present, I let the disability department know and I was not marked on my speaking skills. Have you fully dropped out? Don't be hard on your self, its not your fault. It is uncontrollable, I have been there. I had to leave a job because of my stutter as well. I hope things get better for you