Bad luck Cariadmon, you must be gutted
Some good advice from previous posts on here, plus you must have done something right to make it to the 3rd stage.
Ive heard of loads of people who are in NATS after their 2nd and 3rd attempt as im sure many have.
If you apply again next time it will show that you are determined and im sure will go in your favour for 2nd attempt, but try and keep your chin up until then