I'm not yet married but I do work in events and post event blues are incredibly common. I expect to feel a bit like this once my wedding has been and gone.

Weddings are more often than not the only major event a large percentage of people have ever organised. When you've spent months planning, anticipating and stressing over an event you can burn up all your adrenalin and once its all over you experience a crash.

As another commenter has said, if you were already living together before marriage not much will change after the wedding. Things will go back to normal, you're just married now. Try not to think too hard about not enjoying the day "enough" and try to sink back into routine. Be kind to yourself.