Its been a week since crown prep and it still hurts is this normal?

Typically, no.: Perhaps the tooth cannot recover from the accumulated trauma of fillings over the years and now the crown preparation.A root canal may be needed to remove the nerve and make you comfortable.A foundation build-up,possibly with a post will then need to be done to provide a proper foundation to support and retain the crown.Ask your Dentist and get referral to Endodontist (specialist) for root canal.

2 options: It might be a reversible pulpitis which will heal itself, or it might be an irreversible pulpitis which might require root canal before final restoration.