Am in the middle of getting a root canal on a broken tooth. Had trouble numbing the first time but she gave me like 4 or 5 shots to clean it out but finally got it done. The dentist packed the tooth with something to i believe she said help the nerve and make the temporary filling last a little longer until my next appt. (it smelled bad - like the dentist office) She then gave me a prescription for Antibiotics which i took. For the last two weeks i couldn't eat on that side because my tooth hurt. Not like constant pain but if i hit it accidentally it felt like i bit into metal and it sent me thru the roof with nerve like pain. Today was my follow up appt. to complete the root canal and remove the nerve and after several shots and 2 hours in the dental chair i still couldn't get numb. My cheek and surrounding gum tissue were numb but the actual tooth wasn't. She said what she put in last time may be giving off some sort of electrical charge and or possibly still some infection. She gave me another prescription for Augmentin and i go back to try again in about 3 weeks. Should i be concerned with my dentist? She's been great previously and i've never had a numbing problem before - could it just be this tooth and this nerve and what should i do?

Optional Information:
Gender: Female
Age: 43