The journal is a great idea. You will find that invaluable as you move through treatment as each time you see the treating team they will ask what side effects you had and when. With everything that's going on you tend to forget things as well as the chemo brain fog. I found writing stuff down helped my team pinpoint what was causing my symptoms and then suggest options to make things more manageable. In my case the steroids seemed to cause a lot of my issues rather than the chemo so we tweaked the dose. I also did a great program focused on the lifestyle aspects of cancer treatment which was free through my union, I'm in NSW and noticed you're in Queensland so not sure if there is anything similar up there, but I'll copy in the website so you can have a look and it may be useful for others reading this thread. They have a program for patients and also one for caregivers.
https://osarahealth.com/en-au/psacpsunsw/