oh little not-hedgehog, i am really sorry for you.
that would make me furious. i am glad you are trying to stay calm because i'm sure you can be more efficient that way, but i agree with ravenne, you should fight for this thesis, you have spent so much time and energy on it already it would really be a shame to see it go to waste. i think you should follow her advice, lock yourself in the office with a tutor who could help you, don't let him answer the phone or talk to anyone until you have convinced him. good luck !
halte die Ohrensteif !!