>>1You're correct, this is the perfect place for this sort of thing.
However, don't fret so much.
You're young, and that means that your body can handle itself a lot better than someone who's much older. If you can treat it early (which is what sounds like it should be in, if it's there at all), then you'll be just fine.
You'd be surprised how far medical science has advanced in the past few years, really. I'd actually be surprised if you would have to go through chemotherapy, but I doubt it.
Don't panic, check with your doctor frequently, do what they say, and you'll be perfectly fine, trust me. Older people who have it worse have made it out of this, so it's not unrealistic to say that you will as well. Just keep in mind that your mother expects the worse, if only out of her worry for you as a caring mother.
Best of luck.