I'm not bi-polar, but I've read a lot about meds...I have a long standing (amateur) interest in biochemistry rather than in the actual drugs themselves, and I live in the UK so I don't know the generic (non-trademark) names of your drugs, but with what you're on, I'm not surprised that you can hardly stand on your feet. Frankly, I'm astounded you can work a computer !
First of all your liver must be working overtime to break down all those different compounds; secondly, (correct me if I'm wrong) aren't some of those drugs supposed to do the same things ? If so, they are almost guaranteed to act synergistically; in other words, the side effects of one don't just add to those of another, they multiply them. If you are getting severe headaches, that's a sure sign that you are basically in sore need of a decrease in these meds.
Having said that, if I was in your shoes I wouldn't throw the pills away just yet. That can be a really bad idea. But I'd certainly want to make sure that this is an absolutely necessary, must-have cocktail I was on, rather than a "Oops, i forgot you were on that" or "It's not strong, it won't harm to mix them" happenstance. I'd doubt the word of the prescribing doc; try a second opinion.
Not to alarm you, but drug-interactions have a very well deserved reputation for causing medical mayhem. Have you tried PubMed to see if any of these meds are not to be taken together ?