Skipping a beat

Hello,
For the past 4 or so days,
My has been feeling as though it skips a beat
I went to the ER the day before yesterday.
They did various tests but said that they weren't seeing anything serious.
BUT my heart wasn't doing anything weird while they were in the room.
But when they would leave it would.
I would sit there,watching the heart monitor until it would happen.
And there was a noticeable change in the rhythm.
I don't know how to explain it,So i'll try to show you.
It was kind of like this.
^---^---^---^---^-U-^--^--
That dip is what I was seeing and feeling.
What could this be?
Im not feeling any chest pain,Dizziness, or shortness of breath.
I HAVE been really stressed out lately.Really bad the day before this started happening.
I also have been vegetarian since before march.Is it possible that Ive developed some kind of vitamin deficiency?
Please....somebody help me.
Im scared that im going to die any second.

[is_something_wrong]

What you describe from your rhythm strip is a PVC, or less likely a "wide complexed PAC" (I'm a little confused because it seems your "pause" is a bit shorter than 2 beats, I would draw a PVC like this:

I----I----I----I-U------I----I----I etc.. (anyway, not easy to draw EKG's with letters and lines ;)

Anyway, premature beats are almost always benign and usually caused by stress and anxiety (which seems to apply to you).

Go to your primary care physician and ask for some standard blood tests (electrolytes, thyroid function, vitamins, etc) and a normal 12 lead EKG, not just a rhythm strip.

This seems like nothing to worry about to me, but you may see your doctor to do the blood tests and to get some reassurance. It often helps to reduce premature beats. Everyone have them, but not all of us notice them.