I took the exact same EPA, I took it a few years ago, had the heart palpitations, thought it was related to diet change, stopped all changes including the EPA pills and mostly went away. 2 years later started taking it again, within a month I had palpitations. They did heart monitor for 24 hours, said benign palpitations.
Stopped taking it, went mostly away, when I say mostly I was getting them a couple times a minute and now I get them a couple times a week. So definitely not something I can take. I don't really need it, was just a supplement, figured couldn't hurt.