Hey Kath, it's weird when you get to the point where everything feels like it's unravelling. You don't feel like you have enough hands or energy to do what you need to and even the weather feels like a personal insult. And, of course, your brain is either in overdrive or reverse.
I've got a fair idea what advice you'd give to one of us in the same position. Priorities become important. Do the minimum at work, eat cake if you want to, feed it to everyone else for dinner and deal with the consequences later. As for the birthday party, if there is enough food and plonk, people usually cope, forget about the extras.
Take a breath, put your feet up and stop looking after everybody else, just for a couple of days. Drive the first leg of the trip to Adelaide if you feel you must then take a pill and sleep the rest of the way. The people around you will step up if you step down.
Enjoy your new foobs. Marg xxx