You have had quite a mixed bag of comments here already and I have to agreed with Tonya. I think it's probably totally random who suffers and who doesn't so if you do need chemo, I think it's best not to have any expectations until you begin. I think a positive attitude is really good though and it helps you through the emotional side of treatment but I don't believe it has a real bearing on how you will react physically but it can't hurt.
Just to let you know that I had two tumours in my left breast, one was TNBC and the other was ER & HER2 + and I was told by my oncologist that TNBC responds well to chemo and as I had extensive DCIS left on my breast after the two tumours were successfully removed, they didn't know (if the pre cancer cells developed) whether it would be one or the other type that I had they told me it was best for me to have chemo to cover all bases. For the HER2 + tumour, I am having 12 months of Herceptin targeted therapy. If I only had ER + tumours I possible would not have had to have any chemo, just radiation.
I think I expected the worst and hoped for the best and my side effects were probably somewhere in between.
Hope this helps and good luck Jessica.
Love Janey xxx