A&E. Unfortunately, the surgeon doing the op aren't scheduled to see folk outside of the in-patients appointments.
I went in after 'both' of my nut operations - the second op was done by a surgeon, but I still went in via A&E, they contacted Urology, they checked me out, then when home, my surgeon phoned me up to check how I was - lots of nasty swelling, but to be expected I was told. My surgeon was excellent though. Did take a very long time for the wound to settle.
Do what they say and go to A&E. They deal with stuff like this every day, so are better prepared to sort it, than the routine surgery departments.