Hlo before 3 years i have felt my palpitations and after checked doctor says normal and after that palpitations comes occasionally but now recent days i have felt that heart beats very strong i felt it in my neck after heavy meal and suddenly when i lay in sofa i felt very strong beats and by the time i checked in oxemeter rytham is normal and i mentioned that beat to beat gap and after 1 minute it went normal daily i feels strong beat i done all tests ecg,echo,blood tests all are normal why do i get stronger beats i am worried about it plz give solution