Have you experienced any pain, nausea, dizziness? Have you experienced any anxiety during those symptoms?

I have not experianced any of those during these episodes. I do feel dizzy when I get up too fast but thats something unrelated I believe.

Feeling dizzy when getting up too fast is normal...It is called orthostatic hypotension and you become dizzy because when you get up so fast most of the blood goes to the inferior extremities and the brains remains with very little blood. But it gets back to normal in a few seconds. Try not to get up so sudden.

As for the "heart problems" ...I think your heart is not the problem...I believe you have experienced panic attacks....But a visit to the doctor's is a must. Possible heart problems are nothing to play with. Get yourself checked and whatever the problem is, you will get treatment and you will feel better.

Good luck!