how to prepare or be less anxious about dentist ??

Taking deep breaths and breathe thru your nose during injections will help. Know that your dental care provider is there to help you not harm you. Ask the dentist to hide the needle and not make it obvious. Closing your eyes helps too! In reality the injection is the easy part. It only takes a minute and then your numb! Do not forget to tell the doc about your meds and your fear.

Call his office and be honest how you feel. I had a friend who was in the situation. They postponed her appointment 2 days and gave her a script for 2 zanex which she took 45 min before her next appointment. She was so nervous she wanted to hold her hand.