No reflex in knees after plastic surgery: tummy tuck and muscle repair?

I saw my endo and he did the tapping on the knee bit, only nothing moved. No refelxes, nothing. He tried again with his stethoscope and nothing. He didn't seem worried, but I am. I've recently had a tummy tuck/muscle repair/lipo on October 19. I've noticed my bladder is less "sensitive" as in I don't feel the need to pee as often. Could this all be related? I will talk to my surgeon, however he's so busy I fear he may dismiss my concerns. Thank you.