Suggest Medication For Distinct Palpitations During Root Canal Procedure

i am having a root canal procedure. already gone through one session. i took 2gms of diazepam, in addition to the shots the dentist gave. i take meds for hypertension, 100mg of atenelol, and 100mg of losarton. as soon as the dentist gave me the shot, i had distinct palpitations. i asked for water, and relaxed myself for 10min before starting the procedure. tomorrow i have another appt. i am thinking of not taking diazepam as i have not taken it before. the dentist told me that because of my age, 65, she is not even giving me epineprine. should i take the valium this time or not? thank you for your advice. lalitha