Oh Flatwhite, I'm so sorry for what you're going through. I was exactly where you are in November, I've never known shock like it.
Tell them about your plans, if it's going to be a restful holiday then I'd definitely go, and I'd have the surgery asap so you get as much time as possible to recover beforehand. You could ask about an MVA, which I had, as it's done under a local so you're in an out in a couple of hours. I started medical management so had passed some tissue but it got stuck so my only option was surgery and at least I knew once it was over it was over. They do an internal scan at the end of the procedure to check everything's gone, which gave me peace of mind.
See what they say when you see them. Even with an ERPC you'll be in and out quite quickly. You might be able to have it tomorrow.
You'll be on a massive rollercoaster for quite a while. I did shock, disbelief, denial, rage, heartbreak, numbness, acceptance and back again on rotation for months. Whatever you're feeling is normal.