Is it just Anxiety? This just anxiety?

Hi, Last week while working late at night I felt my hands are trembling and I visited a hospital where they took my ECG, 2D EchoCardiogram  and Troponin - I test to which he confirm that it was just Anxiety and Stress which is true I take a lot of stress. He asked me not to worry. Now that was a week back & today afternoon I got angry at some stuff and Idk why I started having some thoughts that I got some pressure at my heart. I was thinking that & all of a sudden I felt as something big entered my heart from bottom and I felt for a very small like millisecond that my eyes closed sort of. I got scared and check on smartwatch my heartbeat was showing 120+ so I rushed again to hospital and some other doctor just checked my heartbeat, BP and last week reports & said you are just anxious and not to worry and I became normal again but when I came home forgot to tell that thing that something that I felt entered so again I got anxious & I see my heartbeat increase so is this just Anxiety?