Is An Episode Of Experiencing Elevated Heart Rate With Occasional Spikes And Frequent Heart Pain A Sign Of Long-term Danger?

Im a bit concerned. On occasion my heart rate will go to around 200 bpm (once every month or two) it will stay like this for about an hour and a half. On one occasion it was 267 and I had to go to the er. I also now experience consistent heart pain every 15 mins or so and it will last about 3ish minutes. Am I in danger long term? These sudden heart rate increases that go around 200 and last an hour has already happened 2 dozen times.