The real key thing in an interview is that they are looking for someone whom they would want to work with and be stuck in the adjacent desk every day. So, relax and show some personality and have some confidence.
Keep your networking game on, and stay optimistic. Dust off your researching skills while you're at it and stay in touch with your career field. Don't fall behind just because you're not sitting behind a desk everyday. Be your own boss while you're looking for a job, and find invaluable and creative experience to add to your resume.
Burnout can come in many forms. It can be gradual, or sneak up on you after one tense meeting. Stress comes with any occupation, so knowing when to identify burnout is very important.