Though I have written on this topic before, I am going to revisit it, because I am experiencing a marked state of both creativity and mania at the same time--in the here and now. This is not uncommon for those who are bipolar, but it can be hard to deal with each time the state pops up.
I should mention that there is a spectrum of bipolarity and many creative folks may be familiar with this syndrome, though they are not Bipolar, per se. So this discussion may be relevant to many bloggers reading this.
First suggestion is to write down the creative ideas that will flow out of you (in shorthand), and tell yourself that you will flesh out one of them, but not get frustrated that you can't deal with more than one in the moment. If you don't adopt this strategy, you may become frustrated and fearful that all of those ideas will vanish into thin air.
Second, watch out for unrestrained anger, even if justified, when in the manic state. And if you do go too far, and catch yourself, be sure to apologize and back off.
Third, if driving, make a conscious effort to slow down and pay attention. You will be prone to accidents or speeding tickets if you are not careful.
Give yourself permission to play around with ideas when in the manic or pre-manic state. Many Bipolars are extremely creative and we can tap into the creativity without going over the edge.
Tell someone close to you what is going on. That step can assist you and the other person in dealing with the situation.
Finally, remember that "this too will pass." Go with the flow, try deep breathing, take short breaks and set a firm time limit for work. And watch out for overeating and too much caffeine.
Well, I have lectured enough. My own state of being right now IS manageable and i plan to keep it that way.