So I wake up and go on with my normal practice routine; but today I started my warm up with lip flexibilities (Very Slowly). Did my intense tongue exercises and put the horn down to return 5 minutes later. Curiously enough, my lips would allow me to play anything than the middle range E and G!!! The felt fine, responsive at the low register, but I sounded horribly strained on just about anything in the 2nd register (besides C). This causes great concern for me as my effective** (Fully Fluent) is an A to the A below high c typically. I put my horn down after some gentle long tones in the lower register and I think i might have pulled or stretched my lips. Any comments?