Fox News Flash top headlines are here. Check out what's clicking on Foxnews.com. "I am now the most miserable man living," Abraham Lincoln once wrote to a friend. "If what I feel were equally distributed to the whole human family, there would not be one cheerful face on the earth…. To remain what I am is impossible; I must die or be better, it appears to me." May is National Mental Health Awareness Month, a time to remember that millions of Americans, at some point in their lives, experience mental health challenges. Our greatest president was no different. Lincoln was famous for his "melancholy" nature, marked by spells of deep sadness and gloom. "His melancholy dripped from him as he walked," his law partner William Herndon observed. "No element of Mr. Lincoln’s character was so marked, obvious and ingrained as his mysterious and profound melancholy," another fellow attorney wrote.