I'm not sure how I did it, probably over-blowing and definitely over-playing, but my lips have become weak. My range has diminished brutally and it hurts to do exercises like long-tones and slurs. Not a burning, like when the muscles are working hard, but actual pain. I took a couple of days off, which normally does the trick, but there is no improvement so far. How can I heal my lips? My frustration grows everyday.