First time I noticed this was last year, happened once or so but just a week ago, I was lying down and i had to breathe in with an effort to get some air and my heart started pounding slow but hard that my chest could feel it moving.
Is this a known symptom for a disease? For the past 2 nights, I try to goto bed and I can't help think I'm not gonna wake up. Is my heart getting weak? Should I go see a doctor? If yes, what kind of doctor?

Thanks