Maybe NTs are more vulnerable in a way because they tend to stuff their feelings more. You can control emotional expression but the body never lies. At least that's the case with me. When I undergo really emotionally intense situations, I may act calm on the outside but my bodily reactions are strong.
Yes, I've seen this happen to a good friend (INTP). When the full realization of a major loss hit him he actually went blind while driving his car and nearly died (most likely a panic attack.) I felt so badly for him, it was heartbreaking.