Rapid heart beat + dizziness?
About a week ago, I started noticing that my heart beat would randomly speed up at times for a few minutes, causing me discomfort. Sometimes while I'm skateboarding, or sometimes just while I'm sitting down doing nothing!
I've also had two instances in the last week where I stood up and then got really dizzy for a few seconds (one of the times, I lost vision very briefly).
What might be wrong with me?