So many of us have found the festive season is anything but. Im dealing with my second incidence of BC and the wretched holidays have gotten in the way both times! In future I'll have to remember to start the whole process in May or June to avoid all the stress and inconvenience...
It sounds like you've had more than your fair share of complications, let's hope the chemo goes a bit more smoothly. As the others have said, it is a lucky dip--there is no way of knowing how it will effect you and very little you can do to influence your reactions. I think the main thing to do is keep a journal and make sure all your team knows what is happening to you. They are not psychic and if you don't tell them when you have problems they won't know when to start tweaking things for you.
There is a wealth of personal experience on this site, there are many "hacks" you can use, it's worth asking for advice, someone else is bound to have had a similar experience.