I had almost the same feelings as yours when I was told that I am bipolar.

The first and foremost thing to do is study as much as possible regarding bipolarity. There are plenty of online resources, many of them are good. You can try some books too, there are plenty of them.

The strategy to manage bipolarity depends on your symptoms and experiences. But, being just dependent on meds is not gonna work in the long run. So, good nutrition, regular sleep, exercise, watchful life are few useful tools in managing bipolarity.

Anyways, after a while, I felt that I should not worry. Because, its just a condition of the body and mind and its manageable.