I don't know about the rest.
But I think that any fair reading of Lincoln's life (and I've read more than a few biographies) would likely suggest that he was clinically depressed. Coolidge also seems to have suffered from severe depression as a result of the death of his son while he was in office.
Abe had his ups and downs. But he did not allow his downs to interfere when it really mattered. It was a triumph of the will. Abe's worst down happened before he became famous.