Hello and welcome to HCM
The you are taking can cause multiorgan Hypersensitivity
which can cause your heart to beat fast. If after taking this medication again you feel same than discontinue it and consult your doctor for alternative medication.
As you get your heart check up recently and get it all right so their is very less chance that it happens due to problem in heart.
Other possibility for such a episode can be stress
. For this you need to be relax and take rest.
Hope you got your answer.