Dear Ladu,
firstly can I say how sorry I am to hear of your recent diagnosis. You WILL get through this. Also, whilst it is probably not a group you would have chosen to belong to, welcome to the forum. Everyone on here is lovely.
I was diagnosed in Aug, and had surgery in September, followed by radiotherapy. With regards to preparation - I am going to write what worked for me, but take/leave as you find useful:
Firstly, Shore up your support - talk to everyone/anyone as you need to. By doing that, you can guauge who is likely to be able to be there for you, either psychologically/physically. Some people were supportive at different stages. You can also use different helplines, eg this one, your own specialist breast care team, Macmillan, plus lots of others (lots of info in your bumpf?).
Physically - you say you are fit - that is good. And you are also young. Both those things stand you in good stead for recovery. Try and stay fit, and whilst it is tempting to loll around comfort eating, (especially as we near the Christmas festivities), try and eat as healthily as you can and get some daily gentle exercise. A walk round the block is good not only physically but mentally too. I found running helped me destress, and it was the one thing I still had control over at the time. I think I did the most mileage I had ever done, the week before my surgery!
A conversation with your Breast Care nurse might be helpful about what sort of bra you will need post surgery - depending on what you will be having done.
I found journalling quite useful, particularly when I needed to rant. I also found writing lots of lists helped me stay organised - things like food to make for the freezer, what jobs I needed to do before treatment, etc.
Don’t underestimate the psychological impact that a breast cancer diagnosis can have - so do try and plan some nice activities, or things that you find pleasurable/calming. For me, it was crafting, and mindful colouring.
You didn’t mention it, but do you have family with you/nearby? Try and talk things through with them if you can.
It is early days, and you will find yourself attending lots of appointments/clinics which can be exhausting, so if you are still working, do take time to rest. Might be worth explaining to your employer what is going on. Take a notebook and pen, and write down questions you may have. for each hospital visit.
Anyway, that is probably enough to be going on with for now. Do come back to us with any updates, or further questions. Whilst everyone’s journey is different, we are all here to support you.
Take care and big hugs x