Went to the podiatrist today, got x-rays, and the foot is well on its way. I can finally wear two shoes (I brought three right shoes to Ireland, saving a considerable amount of space). I can start walking - gonna do about an hour a day. In about three weeks, she says, I can start running (though not too much straight away).
I've gotten some great advice from Lara, and will be spending the next three weeks planning the training and race schedule. I know this: I'm in this for the long term, and I can force myself to build slowly.
I'm so happy.