Ugh, I hate that post-humanous diagnosis of famous people because that's accurate and totally not made up to make crazy people less inclined to self destruct, as if that would work..well, maybe...
Bipolar really doesn't make for more creative. There are plenty of uncreative and average to below average intellects running around the world with bipolar, many more of those dummies than DaVincis.
But hey, maybe I just have a caffeine and acidic food problem, heck maybe it is gluten, refined sugars or aspartame that's why I'm not creative.