Hi There, I Have Been Pescribed With Amitriptyline 10mg (for

Hi there, I have been pescribed with amitriptyline 10mg (for migranes to take before i go to sleep) and propanonol 10mg (for when I feel anxious or fast heart rate). I want to know if i can take these medicines together? Also I have noticed a strange heart beat like fluttering or very slow heart beats and I heard this can be a side effect and I want to know why.

Thank you!