Two years ago something happened where I couldn't play high and my tone disappeared with that. I had to start all over, I was in junior high and could play double G's. My freshman year I spent building back now and I'm finally good again and I'm now a sophomore. My range has improved dramatically I just got first chair in our school's top jazz band. We're practicing for chair tryouts for concert band (I'm in the top concert band, too) and jazz just started and I've been playing a lot. Yesterday I noticed I was having trouble with high notes for a bit, my lips felt tired even while I was warming up! I was having trouble going between registers but I could still hit the high notes. I can still hit them today and they're a little airy. I'm noticing some patterns and I hope this isn't history repeating. What should I do..?