I'm bipolar and have ADD, and could see them possibly being related, but repressed emotion? That's just about the funniest thing ever! One of the difficult things about being bipolar is that I can't repress these overwhelming emotions if I tried!

I'm sorry, but there's been enough scientific evidence to support the genetic basis of both of these conditions that it's widely accepted in the medical community. It's very well known that bipolar disorder "runs in the family" and that having family members with other mood disorders is extremely common for those with bipolar. In my case, half my family (paternal) is rife with mental illness, and the other half (maternal) is quite sane. There's not that much different between them, although the crazy side does have a bit more formal education, and that certainly wouldn't cause mental illness.

Personality disorders such as those based on repressed emotion and personal traumas don't respond all that well to meds, and do respond well to therapy, e.g. borderline personality disorder has been shown to follow this pattern in a number of scientific studies. Mood disorders that are biologically based do respond well to meds (they are almost always needed) because the neurochemical balance is off; therapy alone is not adequate for most sufferers of bipolar disorder, although it's often helpful due to the many related problems that the disorder-related behaviors can cause. Again, this has been pretty thoroughly demonstrated.

Hyperactivity can be caused by a lot of external factors, especially diet. Although I believe there's a genetic basis for this, just as there is for very different metabolic performance, I think environmental factors need to be ruled out first.