Oh lovely :(.  
It may feel like that for a while but it doest get better. 
The place your mentally in many will tell you is one of the hardest as you have been told just enough to be scared but not enough to know. It will get better as time goes on. 
I felt like I was free falling and have no shame in saying I took diazepam to help me get through that time. Obviously if you decide something like that may help be careful and speak to your GP. 
Do you have a support system?
Its really scary but I promise on here and on Breast Cancer Nows forum you will meet just the kindest people who can relate.

I dont know how Id have got through the last few weeks without the advice, support and kindness of the people on here. 

xxx

Hi lovely, try and stay calm, I know exactly what your going through. If the ultrasound shows clear lymph nodes, I was same at ultrasound mine were clear, and after operation they were definitely clear....massive hugs, we are all here for you. Xxx

Hi again, everything your experiencing right now is exactly the same as I was and the other ladies on here...its the waiting that is the worst part. Speak to a BC nurse at the hospital, they are fabulous at listening. Don't Google unnecessary it will make you feel worse....I'm waiting on radiotherapy now and feel anxious but I'll be ok. Xxx

That's so true, helped me no end....xxx

I’ve done so much googling and wish I hadn’t. Thanks to you all for replying. It makes me feel less alone. I have my husband who is very supportive and grown up chn who don t know yet. Waiting till I know myself before telling them, I’m a teacher and work have been amazing so that’s helping xxx

Sending big hugs :)!! Even the other day it was so helpful putting on like “Ladies Ive had a emotional *** week” and both your messages back along the lines of “Us too” its so helpful when you all have a good idea what each other are going through xx

Oh lovely Im being such a hypocrite saying this I know but please please please try and stay away from google. I didnt and terrified myself. I did it again only earlier this week, made myself feel horrendous, spoke to my breast cancer nurse who assured me things were in fact  positive but I struggle sometimes to let myself believe it. Google is not your friend right now, my advice is to leave it be as much as you can. Awe Im glad you have a supportive hubby and your work is being good. I was almost like a bloody limpet to my poor husband in the early days, we would chuck on movies in the evenings and I just found the escapism really helped, still does some days!. 
Please dont feel alone with this though, even if you just need a space to vent reach out to us here :-) xx

I've had a lumpectomy and being honest it's not so bad, I was stage one and now waiting on appointment for radiotherapy. The ladies on here are amazing no matter what your result will be....xx

 Kwoody Its true, the people who interact on here are so wonderful! We are all on similar journeys albeit the paths we get there on are a little different. 
I had stage 2a Grade 2 IDC and had a left mastectomy with no reconstruction and decided to go with chemo so waiting on Oncology now. 

Its going to all feel a bit overwhelming and still many people have biopsies that end up not being cancer. If however yours does come back positive you aren't alone, be kind to yourself and take it all step by step. 

Its a club no-one wants to join but has some of the most wonderful members xxxx