[ADVICE] I didn't die, but there's a big bulge on my tyre ... ?

[Phteven]

I'm glad you walked away safely.

What the other people said.
Put your spare on, get the tyre replaced and your wheels checked. After DH had a bingle in my car the wheel alignment was off so you might want to get your wheel alignment checked so you don't need to replace all your other tryes prematurely.

[Netix]

The tyre is de-laminating. Sometimes it happens on the sidewall, most often on the tread section. I have had this happen to a spare in the boot! Don't drive on it, worst case it can blow, best it will just vibrate. It can not be repaired. Let me know if you need a tyre shop, I will probably be able to give ypu details of some decent places, depending on whereabouts in Melbourne you are.