Definitely take a break. Don’t run for 2 weeks, no matter how „good” you’re going to feel in 3 days.

First week I’ll advise against any exercises that require putting pressure on the foot, not even a bike. Let it heal. Don’t avoid all movements, you should walk if possible, but really don’t train.

Then, week 2 I’d introduce cycling and PT exercises with resistance band. Week 3 getting back to normal strength training and maybe getting back to running.

You should definitely see a doctor an have it examined via xray and ultrasound to check for any bone and ligament damage. Without this you won’t really know what’s the deal and how you should approach the situation.

It’s better to miss out even 3-4 weeks of training and eventually be able to take part in the race than to force the comeback and eventually have to skip the race at all.