i definitely would have guessed 2nd yr., if not that , 1st.
you are reaching a peak level of intensity where you are being forced to become a professional memorizer. Have you noticed that the primary activity you're doing 24/7 is studying? Sure, you're eating, sleeping, driving (often to a place to study), but basically it is an non-stop barrage of exams.
it's within normal range to be down at this point in med school. However, if you feel how you feel now, you'll only get worse as the summer approaches (after all, you'll be taking the most important exam of med school, esp. important when you are considering ultra-competitive surgical specialties, which provide a lifestyle that is considered "good" in the world of surgery.)
do you have any idea how few spots there are in uro? it looks bleak....
i suggest you see these next six months as a time to buckle down, and make the best of the upcoming situation. you can look forward to the best part of third year i.e. lack of exams (at the expense of hours working), but at least you'll be able to see if you like it or not. if during third year, you hate it, then you can still buckle down for two years and finish with what is considered by many, the best degree...
if you do like it though (which is the majority), then you'll thank me for telling you to buckle down. and you'll have a good chance for whatever field you are going into.
remember though: never ever ever drop out of school/ your degree has potential income of multiple times your debt.