About the waiting - its hard but here's what worked for me. Try, as best you know how, to balance your time researching, cold calling, applying and interviewing with taking care of your health. Its all the stuff you already know - nutrition, limit caffeine, exercise, and don't mess with your sleep.
Get up at the same time each morning, just as if you were going to work, so that your body clock can regulate. Even going for a walk is helpful. Plan for rest and recreation to keep yourself balanced. Make a schedule for times when you do the job search/research (on weekdays), and times when you rest and refresh (weekends.)
Good luck in the job search.