Hi there! I think you should try to get the burnout instrument. As far as I know, Maslach Burnout Inventory (MBI) is the most commonly used measure, and there is a special verison for educators (MBI- Educators Survey). Good luck on your research!
I believe that you can read this document "EMOTIONAL INTELLIGENCE AND WELL-BEING IN TEACHERS" in this link http://scholar.sun.ac.za/bitstream/handle/10019.1/1727/Trudie%20Burger%20m-tesis%2025%2011%2009.pdf?sequence=1.