Am 16 and i had a cavity on the side of my tooth filled. i'm still in great pain, what can i do?

Call your dentist: You can also take homeopathic hypericum which should help a lot with the pain.

That depends: If this cavity was filled less then 24 hours ago then see if an over the counter pain killer helps, and give it another 12-24 hours. If pain is really severe after more then 24 hours i would call back the dentist who treated you for a reevaluation asap.