I'm not saying that Jack has more guilt than the Doctor. Only that he has as much. Personal guilt can be quite as debilitating as that resulting from a public source.

Jack's guilt over his brother and over surviving his comrade in arms is quite strong. Jack has survivor's guilt as well as the Doctor. He lost his home, his family and his first comrade in arms. Jack's guilt is a difference in degree not kind from the Doctor's.

Jack is as unmoored (Unstuck in Time) as the Doctor.