Welcome @TabooGal . Well what a horrible week you've had. You have a lot to take in. I think it's important you get copies of your pathology and scans to help you understand as much about your illness and then you can ask questions.
Not all breast cancers require chemo...even metastatic ones. If it is estrogen positive you may well qualify for the new medication just approved which can't stop advancement for years.
I think also as you were in shock from the news delivery you might have missed things. ..or misheard things ... so hense requesting copies. Your breast care nurse can then go through things again with you.
After lumpectomy they will then redo pathology just to be sure and see if in only 1 node or many. Radiotherapy if no chemo required will be around 3 to 5 weeks after surgery. If you need chemo you will have this before radiotherapy.
I would mention the implanon as it might still have some hormones in it and best removed.
Whst you are feeling is normal. Most of us did not sleep in tbe first weeks. And yes our life is about cancer and appointments for quite a while but it bevomes less frequent as things stabilise. Let us know how things get on and please call the other breast care nurse tomorrow for suppory. Kath x.