I'm 18, don't smoke, don't drink, or have a family history of heart defects. I sometimes get early beats (usually three in a row followed by a sinus pause), but this was my first experience with a tachycardia.
I was stretching in bed one night about to go to sleep when I had 4 straight early beats (boom-boom-boom-boom) and then my heart rate exploded. It was pounding in my chest. I used my dad's blood pressure gauge and my heart rate was 157 bpm and a bp of 153/66 just like that. I didn't have any lightheaded-ness or trouble breathing (although I did have a really tight feeling in my throat) but went to the ER anyway. By the time I got there and an ECG my heart rate had gone down to 101 and they said it had come back normal in terms of beats. After that my heart rate and blood pressure slowly returned to normal by the end of the night. Blood tests came back normal (had a slightly high RBC and calcium levels but that was dismissed by personnel) and I was discharged that night.
My doctor referred me to a cardiologist with a good rep, all my tests (echo, stress ECG, Holter monitor for 48 hours, and an ultrasound of my neck because he heard a possibility of kinking in my carotid artery) all came back normal, and I was told not to worry about it. I didn't have any symptoms for a few months. Just in the past couple weeks, I've noticed that some times when I run up the stairs fast, my heart skips a beat for about 30 seconds. When I take my pulse with my fingers when there would normally be a beat, I just feel it move slightly. I cycle 3-4 miles a day and never noticed this or had any symptoms of lightheaded-ness/dizziness/palpitations (aside from the usual heart ringing in my ears when I'm done), it only happens when I run up the stairs.
My questions are this, if anyone can answer:
1. What happened to me on that night I went to the ER?
2. What's going on with my symptoms right now?
3. Should I have sufficient reason to schedule another visit if I've already been cleared by a cardiologist?
Thanks to anyone who can help me! I'm a bit of a hypochondriac and just want to rule anything out.