i think u developed acute anxiety
as u r very well and due to bad news , because of fear or sadness sometimes heart rate
increases and u become able to feel heart beat . this is called palpitation
dont worry .
talk to your close persos .
try to forget the things .
dont stay alone .
do some breathing exercise
take 10-15 deep breath repeat after every 20 minute
this all will reduce your anxiety .
hope this will help u .