So here's the update:
I have successfully passed one stone. The other two are still in my kidney. I keep having pain as if I am going to pass another one, but the pain is short lived and not as intense as the one I passed, so I know its not "ready" to go yet.
I talked to my Urologist yesterday, and as soon as I told him I was a pilot, he immediately changed tune from "you'll be fine" to a more serious "we need to figure this out." Which I like...apparently, he has a lot of experience with pilots. Good news.
Bad news: He can't do a KUB because the stones are too small. Unfortunately, because the other two have not passed, and they are confirmed via CT scan, I need to wait until they pass....although he offered another suggestion of him putting me out, and him physically removing the stones. No thank you.
He is going to do a 24 hour urine scan, where I save all of my pee in a jar for 24 hours and they do some analysis of it. Additionally, he took the one stone I have passed and is going to do some analysis of the make up of it to determine what it is made of and what likely caused it.
But - my understanding is that I am grounded now until I pass those two stones, right? The urologist said that may be a few days, or it could be a few years.