I've read anyone can get E. You seem to have a number of nervous system disorders in conjunction with E. Epilepsy, bi-polar and fibromyalgia, all at the same time. I am not sure how the fibromyalgia fits into E, but most people with E also suffer with some form of depression too. They seem to be related in some manner.
Your doctor is right in trying to stabilize or control the seizures. And there are some holistic things you can be doing in conjunction with what your doctor recommends. I know we all hear about eating right and you being a young person are particularly challenged. Even fast foods are now offered in many high schools. Focus on eating whole foods as best you can and start taking a daily vitamin. Your nervous system needs nutritional support. Learning what vitamins support the system made me realize how much was actually lacking in my diet! I was surprised 4 months ago by changing my diet and doing a few other things the doc. approved, at how great I am feeling and how my seizures have not reoccured.
It is important to learn as much as you can about E. My first doc wasn't real helpful for me. So, I searched the internet for information. Start here, the Epilepsy Foundation forum, and at BrainTalk. There are a lot of good experienced people in those forums to chat with. It was at the EF board I learned my struggles with depression were related to E, along with why I wasn't reacting to events in a 'normal' manner. Much of it is all related. I never knew that about E. E is more than just the seizures.
My docs really don't know how part of my brain got slightly damaged or why such a small scar is causing seizures. I have a suspicion of how it got started, but will never be able to prove it. Suffice it to say it came from an 8 minute exposure to a chemical called Methylene Chloride. IMHO. My body should have been able to clear it with no lasting effects, but it seems to me some long term damage may have been done. Again all of that is unproven.