Hi Sari,
yes absolutely, from your description, you have been triggered into stress by your mother and your friend.
There might be other themes and layers involved as well, because the heart rhythm is influenced by the ((Circulatory - Coronary Veins (intima)|coronary)) relays as well which are about territorial issues. Feeling full of energy as sympathetic and ((Endocrine - Adrenal Gland - Medulla|adrenal medulla)) reaction naturally elevates the heart rate, too.
Having had the Takotsubo episode, you now may be sensitized and even more aware of these symptoms, but these now don't seem to be primarily related to the shock and the Takotsubo.