May I suggest seeing yourself as your name suggests? -it's beautiful! Exams are seriously stressful, I know, but you can do it. You know your work, and I think if you can dream something, you can do it.
We are all 'listening' on this forum, and we are all here to 'listen' to people who need to vent - we all vent, trust me, my poor friend gets an ear bashing at least once a week! It's necessary, and good for the psyche.
Remember, breathe - if you don't get enough oxygen, your body goes into panic mode, but don't hyperventilate either, or the same thing will happen. Just breathe - breathe in goodness, harmony and peace and breathe out anxiety and panic. Exams never killed anyone, so you go out there and you just sing like you have never sung before! Look at Sasha-Lee - ain't she awesome! I am so proud of her.
You can do it! Believe it!
Good luck my friend.