Aaaaah love, I am almost halfway through chemo, was diagnosed 9th may and am still going through those feelings. It's a crazy roller coaster we are all on, I think you have to enjoy the good days and allow yourself to feel the bad days.
I have mixed pathology ER/PR positive (good) HER2 positive (not so good) Sentinel node clear (good).
Sometimes it's hard to focus on the good and you find yourself focusing on the not so good.
Be kind to yourself and use all the resources you have.
Good luck love
xxDanxx