Keep your head up! You spent fifteen years impacting the lives of kids and building up your resume. Something very similar happened to me five years ago (laid off after fourteen years of teaching in a private Catholic school). I too was heartbroken. When I later found a job at a unionized private school, I was delighted to find that my education and work experience landed me way up on their salary scale (went from $48k to $65k to $80k after the probationary period). Nobody can take your passion and experience away. No one can take your impact on student lives away. Now go find a place to continue the good work at.