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I'm assuming you'll likely be unlikely to see a Dentist on Sunday(?) If you can, that would be awesome. But, if not, perhaps you can make certain to get in to see one on Monday! I'd be guessing somewhat, but the most likely thing to bring on a rapid onset of pain type which you are having, would very often be an abscess. If that is what it is, don't worry, it can be taken care of, but you'll need to see a Dentist, have a couple of x-rays for definitive diagnosis and treatment to get you feeling better again. It "could" be a cavity too. But cavities generally are slower coming on of pain, and not such rapid onset.
Nonetheless, I'd recommend seeing your Dentist of choice asap! Then they can get you feeling GOOD again.
*Please don't hesitate to ask any additional questions/concerns - OK?