I suspect a fractured tooth. Although sinus infection/congestion can cause toothache it won't cause sharp pain upon biting. I think you need to see an endodontist to address the issue.
How does the crown feel to you? If it feels bulky and your bite doesn't feel quite right then it is best to tell your dentist. When a crown is not shaped correctly then it can cause problems in the future.
Hi:My suggestion is to share your concerns with your dentist in the follow up appointment. There are adjustments that can be made to the existing crowns to make it look more natural.Best,Dr. Maddahi