Lower heart rate?

Has anyone ever had any experiences with a lower heart rate? After I had my son 6 weeks ago I’ve had some issues with my gallbladder apparently least I’m assuming, hospital wasn’t very helpful. However each time I’ve been there because of having chest pain and back pain and sweating profusely they put me up to the heart monitor etc but my heart rates been in the lower 60s and 50s when relaxing and that’s not normal for me, so now I’m super worried. I asked to be referred to a cardiologist and they said I could get an echo done but haven’t told me when I’m starting to worry a lot I’m terrified I’m going to die or something