Newly diagnosed, about to start AC

Thanks everyone for all your responses and advice, as you all know everything is so overwhelming in the first month. A bit more info about me - I'm 46, have three kids (13, 11, 9) and am studying for a degree in Nutritional Medicine part time (oh the irony). Until this bombshell I was on track to finish end of next year but this will put me back at least 6 months, assuming I can finish this semester, which I'm really hoping to do. At my biopsy (which happened after a routine mammogram due to family history - can still so clearly recall mentally ticking the mammogram off my to do list back in February), initially they thought it was DCIS but contained, so I had visions of maybe 1 month of disruption (surgery then recovery and surely I'd be back on the netball court in time for the upcoming Winter comp?!). But within a week it went from preventive surgery to "you've got cancer and may need a mastectomy". They are recommending chemo first as the cancer is Her2 positive and apparently trials of chemo then surgery in this instance have been very positive. So herceptin is on the cards as well. I have 12 weeks of AC then 12 weeks of taxol coming up, then surgery after that. It's all so surreal as I feel perfectly healthy (aside from a constant headache and slightly ill feeling since all this began!).