I did the same thing to my first brew. Most of my bottles turned out well. Some were under carbonated, some were hissing. My second batch, I made sure to give it a few stirs before I bottled it. I did have to dump a few bottles, but it may have been an improper seal vice not mixing the sugar. I would say, most, if not all of your bottles will turn out fine. I would just give it a few stirs next time.