There may be an arrythmogenic tissue in your cardiac muscle
that can be giving off these high heartbeats. We need to look out for such abnormal ectopic cardiac tissue.
It is advisable to get Echocardiography
done with conduction studies of your heart.
Also, get your thyroid
The leaky valve as such will not cause a heart rate
of 190/min. It needs further evaluation as I said.
Get well soon.