If the stress from your job is too much, use this personal resignation letter to quit.
After much consideration, I regretfully submit my resignation, effective (date). I wish I didn't have to leave this company, but the stress of (duty) has negatively affected my health and family life.
It has been a pleasure working for (Company), and I'm happy to help out however I can during this transitional period. Please let me know if you need anything further from me.