I accidentally broke a few small flakes off my tooth by biting on a date seed. do i still have to see a dentist? also, how long will it take for my jaw and teeth to stop hurting? this happened last night?

Which tooth? Does the tooth have a restoration? Is there a carious lesion? The tooth structure may be compromised resulting in the fracture. Without being able to examine the tooth together with a radiograph the best advice is to see your dentist.

If you are in pain, than you probably did more damage than you realize. A few flakes may be more than enough to cause sensitivity depending on what tooth and its previous condition. See your dentist for an x-ray and exam and tooth saving treatment. Put hot compress on jaw for relief.