isadora 2021, while it doesn't seem that you have need for immediate help, you should be able to send a note to the doctor telling them that you would like to have Holter monitoring. If you experience the low rate every day 24 hours might capture it. Monitoring can be extended to 48 hours or more.
You shouldn't need another appointment with the PCP to have this ordered. Some PCP offices have the equipment. If your doctor's office doesn't, your primary should honor your request for a referral, maybe to a Cardiac electrophysiologist.