I had these in my 20s also. I am on beta blockers to stop the palpitations, been on them 6 years but I find they leave me calm and can lead a normal life. I could come off them but I can get quite anxious and don't like my heart beating too fast etc. SO yeah beta blockers solved my problem as they stop the fast heart rate from a panic attack which then stops my other symptoms manifesting
Also making sure I have little as possible stress in my life helps.