Pulsations on chest. What should i do?

One day I have huge panic attack and after that a series of everyday palpitations started . I already consulted a cardiologist and he finds all ecg and echo normal and it's only anxiety . And prescribed me beta blocker propranolol . My age is 19 yr boy and I m a student . For some days slowly my palpitations I tension gets lower and I feeld comfortable . But I always feeling in my left chest ( intercostal space ) that my heart is beating . It's visible chest palpation and always feeld like something is vibrating inside me . My palpitation become more when I eat food . And my left side 5th rib is feeld like it is protruded slightly and pulsating are feeled over that rib . My all reports are normal what should I do ?? It disturbs me a lot and interfares with my daily activity . Plzz help