During pre-operative visits we always tell patients to expect to be more tired than normal after surgery. While your body is healing we recommend for them to eat high protein diet and drink Ensure Light with extra protein. Do not drink sports drinks because they are very high in sodium and that will cause you to swell more.
Yes of course it is normal to be tired. You have undergone a long invasive surgical procedure and you body is trying to heal. That plus the stress of any surgery would make you tired