Newly Diagnosed & Over Thinking it all!

I'm a 54 year old women of 3 gorgeous grown up sons living with my partner of 5 years & loving life after a few years of turbulence both personally & professionally. I am newly diagnosed with invasive NST, + for both ER & PgR apparently that's good, yesterday was a week after right boobie lumpectomy & 3 x axillary lymph nodes removed and results show its travelled to the lymph nodes so pet scan booked for next Tuesday. Its been a roller-coaster, which I know many of us have experienced and my positivity since surgery is now replaced with a sick to the core feeling of dread. Which is unusual for me as a normally face everything head on but this has got me. Radiotherapy has been mentioned and then yesterday chemo was mentioned for the first time as a most likely scenario not all results were back & the rest awaits me next Tuesday. My head space at the moment is like a magpie flitting from shiny wtf-ness to omg-ness!! The cherry on the top is I'm 2 months into a new career and on LWOP from a 34 year career wondering what my new employer who has been very supportive will wonder & yes I am over thinking it :)