Sounds like you were right on the border of not having chemo as an option. But better to be safe than sorry I reckon. It's no fun but you'll get through. Lots of people here to help you. When you know what type of chemo (AC-T, TC etc) you can so a search here and find people who've had the same treatment.
Excellent to hear of clear nodes and clear margins! That's one more than me. I had to have a re-excision for margins.
Of course you're stressed! Take some deep, slow breaths. It will help calm your nervous system. Hang in there @Gal. Once you get going with your treatment it gets emotionally easier in many ways. Find some good distraction, get some exercise, keep company with your besties and you'll be right. K xox