Your professor is required to cover a certain amount of material in a fixed number of classes. That means that the speed of the class is not up to her. She can't slow down, so you need to speed up.
Are you already making an effort to learn the material by reading the textbook (and possibly another book, one that you find easier, that you borrowed from the library) and trying to solve problems (the ones in your textbook, the ones in library books, ones you find online, ones you make up yourself)? If you're not, you should be. Just as you're expected to read to prepare for classes in history and look at reproductions of paintings to prepare for art history, you are expected to prepare for math class - and this is how.
If you're already preparing, I suggest another trip to the stacks, or even the bookstore; visits to any math tutoring site your school provides, or the hiring of a more advanced tutor to help you prep rather than to help you catch up; or even withdrawing from this semester and starting over with a prep-tutor already in place before the first meeting of your class.
It's easy to study for classes on subjects we enjoy, and I imagine it's hard for you to study math. But this may be one of those classes where you need to spend more than 3 hours studying outside of class for every hour spent in class. You may find out, however, what a lot of "good at math" students already know: math is made up of a lot of easy little pieces. A LOT of pieces. And once you can take each new one, understand it and fit it into what you already know before the next one shows up (and yes, from here on out that will happen fast), you might even enjoy it.
Good luck with the class. I hope that it will get to be enjoyable, even though I understand that right now it's anything but. But I also hope that, while you probably will need to work long hours at math this term, you also have plenty of time to enjoy those things that come more "naturally" to you.