Yeah, it means you're just like everyone else
. Depression and anxiety often have night/day cycles. The key is not to just brush it off when you feel better. In fact when you feel better is a good time to make the appointment for the doctor, because you'll be more practical about it.
Me, I would get really really depressed, but not real often... maybe a few days every two weeks, with milder depression scattered in there too. It was still a problem. But since "most" of the time I felt OK, it took me forever to decide to see a psych. Now I wish I had gone a long time ago.
One thing that might help is to jot down in a journal how you feel from day to day or at different times during the day. That'll help the doctor to diagnose what's going on too.