Severe Wisdom Tooth Socket Infection?

I had my wisdom teeth removed about three weeks ago. (I know, like a dummy) I stopped taking the antibiotics after a week, but I had some pills left over where I sometimes didn't manage to take all four in the same day.

Last night my gums started swelling - I thought it was because a chunk of my tooth had worked its way out of my gums. But I woke up in the middle of the night and it was so painful and starting to swell, I couldn't sleep. I called my surgeon's office the minute they opened and they prescribed me a different antibiotic, Clindamycin 150's. I've taken two so far.

But now that their office is closed, the wound has started oozing and swollen up MONSTROUSLY, much worse than when my teeth were initially removed. It's hard along the jaw and the gum has swollen up around and over one of my back molars, making it painful to close my mouth and nearly impossible to eat.

Is this to be expected right now, or should I be seriously worried?