I have not posted on this website before but have looked and gained comfort many times. I just wanted to say hope all goes well on wed. I agree the wait is the hard part. I can remember waiting for my bilateral mastectomy and worrying (I only had to wait a week, so sorry I don't really fit your brief). I had two cancers 2.2 and 2.9 cm, both grade 3 triple negative and ER positive respectively ( my breasts were having an eachway bet). My nodes were negative and 15+ months post diagnosis no sign of recurrence (cross fingers). My point is that thankfully your cancer is sounding much smaller which means hopefully good news on the lymph node front. All the best.
While waiting these things may be useful to do ( helped me):-
Try getting a great collection of uplifting songs on your ipod (my daughter did mine, I hope legally)
Borrow a computer chair with arms for when you get home (my neck and shoulders got tired without support)
V shaped pillow was a godsend-Target has cheapies.
Also one of those travel pillows for your neck-blow up one from chemist cost$7.
Get some cups and plates down from high cupboards ready for when you get back (not meant to raise arms above 90degrees and you will want a cup of tea when you are home alone). I have many other tips that I am happy to share but I am sure they are covered elsewhere in this website. Also delegate jobs if no time-people want to help.
Hope all goes well, Mares