Hello I Take Atenolol 25mg Once At Night Along With

Hello I take atenolol 25mg once at night along with amitriptyline 25 mg , in the morning I take max aide 37.5-25 along with potassium pills 20 mg...... The second night I took the night meds I awoke around 3am with a very low heartbeat I was to scared to take my blood pressure because sometimes seeing the numbers cause a panic attack ... I didn't take any of the two night meds last night but had bad anxeity and rapid heartbeat today ....my question is should I stop taking taking the atenolol or can I maybe cut the pill in half? I'm out of town until next week and can't get in to see my drs until then.