I've been playing trumpet in school for about 5 years now, and while I wasn't ever particularly good I still had decent range and sound ( C above the staff). I play in a youth orchestra and the concert is this Saturday. However, ever since last week, I haven't been able to play properly at all. My throat locks up beyond octave E, and my bottom lip seems to hurt a bit. My range is completely shot which is a big problem because all of the pieces being played at the concert require me to play above that E ... From what I can recall, nothing has really changed in terms of my embouchure... it's positioned the same way on my lips and I can buzz fine (though on a mouthpiece my range has shortened as well. As soon as I approach higher notes, it just becomes air instead of a buzz). I think I already developed some sort of subconscious barrier playing upper register after so many failed attempts this week and my throat just refuses to let any air through. I think I'm completely screwed for this concert. Can anyone help me?