Congratulations Nanna. Emotional is OK. Rant and rave, cry, laugh it is all natural. Dont hold back as it is quite a big release and you will feel better when its out. Dont feel guilty ( easy to say not so easy to feel). No one asks for this insidious disease. And I dont think there is a pink chick who would want another to have it.
If you havent already start a journal/diary. I find that writing thoughts down helps. Plus as I have gone through the chemo I have found writing down the changes, events, instructions etc have helped build a picture of how my body reacts and the phases to expect each cycle. Also in my diary I write the questions that pop into my head to as the nurses or doctor.
I found Dr Google helpful and overwhelming at the same time. There is alot of good information out there on various cancer sites and some useful links to group suport. There is also some scary stuff, but it all helped me formulate questions to ask my Oncology team. Now I am into the treatment phase I find I dont consult Dr Google often unless I am looking for a book.
Be gentle on yourself. Take care. And remember you are not alone.