> What I'm wondering about is whether otherwise undamaged people who repress their emotions eventually go nuts, or whether people who control their emotions end up in control of their emotions.
imho the opposite of repressing one's emotions is not controlling them; it's bottling them up.
to me, controlling one's emotions means feeling the pain, happiness, sorrow, anger, whatever, and then choosing how you want to act based on feeling that emotion. most people assume that emotion dictates behavior, but you always have a choice about how to react. i.e. you can feel the sting when someone insults you, but you can choose not to punch him even though you're feeling hurt.
bottling up one's emotions, otoh, represses them. you choose to ignore (usually negative) emotions. these are the ones that tend to come up in destructive ways later on.