Man, you have my sympathy.
I had a stent for about two months, and it drove me nuts. No pain, but it make you feel like you have to pee all the time. The last bout they had me go through the same procedure you did, only to find out that the stone apparently broke up and was passed on it's own. A $1000 co-pay and several days of passing blood for nuthin' That was pretty annoying too.
Glad to hear that things went well for you, and hope they take that stent out real soon!!