@55Jlz Excellent words from @Romla above, and they correlate with much of my experience. I had a hookwire placed, your tumour must be deep like mine was. It's no drama, they numb the area with a local and guide it in with an ultrasound. The blue dye sentinel node biopsy stings a bit but wiggle your toes and take deep breaths and you'll be right! It's over quickly. Then the operation is not too long, mine was two and a half hours.
My surgeon carefully paced the information he gave me too; I think it's something good doctors do. I think you must be in good hands! Feeling numb to start with is your brains way of cushioning you so you have a chance to absorb the shock, process the information and continue to make practical actions. When that wears off it can be very overwhelming and being tired is a normal response to that. Be kind to yourself, rest, and if there are people around you being kind and wanting to help, let them. Do you have a breastcare nurse to talk to? Mine is great, I always feel better after talking to her. Don't hesitate to call yours if you do.
And then there's always this marvellous forum. Someone is always here to reassure you, sympathise, assist so don't hesitate to ask/vent/rant/worry/share! Best wishes and let us know how you get on. K
