Anyone else have this symptom?

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I have been getting what feels like a flutter in my upper chest. It also feels

kind of like my heart skipping a beat, or a " deep " beat. When it happen I feel

kind of tired.

It isn't painful, but it is alarming and sometimes I feel like I need to sit

down.

Now I have been in to the emrgency room twice for this and in one case was held

overnight for observation. They found nothing wrong in both cases. I have not

had a stress test.

My GI doc believes I have achalasia and has suggested that maybe the " flutter "

is my esophagus doing strange things.

Again, it is not painful, but rather alrming and makes me kind of feel out of

breath for a few seconds.

Could this be an esophageal spasm? Or would those be painful?

Thanks!