So...we got Gideon an MRI to figure out what's back there.
No results yet. Hopefully today.
On the positive side, Matthew was his usual spectacular self. Despite getting less than 25 minutes of nap, he stayed happy all day and didn't mind (until the very end) being cooped up in a stroller in all the doctor's offices.
And that includes his 10pm trip to urgent care to search for a sticker up his nose. That they couldn't find. *sigh*