Margarite, I agree with Mark. But before you even talk to the Disabilities Dept on campus, you might be able to just talk to your thesis committee or the Chair of your department. Write them an email, or leave them a voicemail about what's going on with you. They may be able to postpone your thesis. Make sure you withdraw if you need to as well, because financial aid has recently been cancelled for several of our graduate students because they've been here just a little too long.