Although, it's authentic, it's not wise. You have to be careful with employment, because you want to show that you're capable of doing your job, and that's going to show them them and others the complete opposite. Word travels fast. Don't sabotage your career path due to poorly written reasons. Instead, put "personal reasons" and if they ask why, simply state that the job was beginning to affect your health over a prolonged period of time. Hope that helps!