In April I had a lumpectomy and sentinel node biopsy, plus further lymph removal for more tests (they were clear), and am now halfway through chemo. I am told my prognosis is pretty positive.
With any luck and a good wind you won't need the chemo, but I wanted you to know that I am a few months ahead of you on more or less the same road.
I am quite sure you are very scared, but try not to be. Personally I found the part you are dealing with now the worst part. Once you have started treatment, and got rid of the bloody lump, you will get lots and lots of support, and plonketyplonk is quite right (imho) that you will get all the support you need from the hospital and the organisations she mentions. Do NOT Google. You will be OK, really.
I am not giving you any horror stories because I don't have any. Funny ones, yes, but not horror stories. Try to take one day at a time, and be positive. It makes a big difference to how well you respond to treatment.
personally I was very worried about chemo, would have done anything to avoid it, but so far, I am tolerating it well, people are very understanding and the problems are relatively few. And you get lots of flowers and treats! You can even have wine!!
None of us would ever have wanted to be here, in this siutation. But we are, and it need not be as bad as you think. Try to think positive and believe you will cope fine - and you probably will.
I am not going to link you to the breast cancer support thread - I think it night get you a bit ahead of yourself at this point. Just take it a step at a time for now.
Honestly, it'll be OK.