I had to rework my embouchure in college after developing some bad habits. It was painful. But push on through and good things will happen. The story is always encouraging to me. It is the story of a trombone player Megumi Kanda who when she got to America and the conservatory, her embouchure was ripped to shreds from practicing too much the wrong way.
She spent nearly a year building it back up with the help of a great teacher.
Read this story, it is a good one
http://www.afm.org/im/cover/08-03/08-03.htm
M&C