So sorry to hear of your diagnosis @Caroline71 - it is such a shock - my lump was also found 4 months after an 'all clear' mammogram - I was diagnosed in Jan 18.
Some great advice has been given from those above - take lots of deep breaths, and try to keep yourself as busy as you can doing things you love as you head towards surgery/treatment. After the surgery & you get your pathology results, your medical team will give you a clear 'plan of attack' - and it somehow becomes a bit easier then.
Try not to overthink it as your brain just goes into overdrive! Being upset and angry and fearful for the future is all a part of it, I am afraid. Let the tears fall - it can be quite cathartic.
Do you have a close friend to attend your appointments with you? Two sets of ears are always better than one - plus the physical & emotional support and being driven there & back. I also recorded most of my appts, so I could go back afterwards to listen again, as it can be difficult taking it all in at the time.
Write down any questions you have to put to the Medical Team
Whereabouts are you (state/city/town?) Members may well know of specific services available to you there.
You are not alone in this - we've all been there & know exactly what you are going thru. Put up any questions that you may have & you'll get an honest answer here.
Take care, we are all thinking of you & all the best for your scans xx