My heart beat feels irregular? help!!?

I went to the docs with his the other day after checking my pulse. It feels weird as in sometimes it would skip beats and other times there would be extra beat. The rhythm isnt too wild or erratic but not perfect either. The doc took my blood pressure, check my cholesterol and took blood. All turned out fine. She also sent me for an ecg and that too came back clear. I initially felt relieved however I have since read that a 24 hour monitor is sometimes required as the ecg wont pick up problems if the the irregularity is intermittent and may miss problems. Should I go back to the doctors and push the issue? Can these sort of things be irregular? Im meant to be flying next week and dont want to hit the deck at 30,000 feet! haha. Im only 23 dont smoke or drink alcohol and exercise regularly. thanks in advance for your input