Respiratory, Cardiac, or gastric: who knows?

I have been having cardiac symptoms such as early beats, episodes that resemble very brief SVT's (< 30 seconds, has made me nearly passout before),  atypical constant chest pressure short on breath, fatigue,  and most unusually chronic nausea.   It doesn't exactly feel like I'm going to throw up, feels more like you get excited about something and there's butterflies in your stomach, but if they're always there they get annoying and disturbing.    At times it gets worse and worse like a big knot builds up in my upper abdomen and then my stomach contents are involuntarily regurgitated into my mouth.    These symptoms all go on day in and day out without relief,  with fluctuations from annoying to disabling.  

I have had an extreme amount of cardiac testing, including CTA, nuke stress, echo, chest xrays, EKG's, blah blah blah...nothing in my blood chemistry or liver panel, thyroid is normal.   I ignored the offer for an EP study, I don't want to get too crazy just yet.

I am honestly starting to wonder is there is an extra-cardiac origin, and I will tell you why.  From everything I've read, nobody with SVT's, palpitations, or cardiac issues have much nausea unless they're in the middle of an acute attack of some sort.  Even in a normal rhythm I have it.  My palps seem to get a lot worse after eating red meat, And then there's stomach regurgitation.   Last year, I had upper abdominal pain that I was EGD'ed for and I had mild gastritis. I don't feel much abdominal pain anymore, but, I do sometimes have brief pain from that upper right area that shoots into my right shoulder.  It never lasts too long though, but I have definite tenderness laying on my right side.     18 months ago, I had an abdominal/pelvic CT scan that was normal at the time, this was well before my cardiac type symptoms and when I still had ibuprofin induced gastritis.

[National Jewish Health]

What you describe suggests that the irregular heart beats are but one sign/symptom among the other symptoms of chest pressure, shortness of breath, fatigue and nausea and not the cause of any of them.  That the main problem is not your heart and that there is another, as yet unidentified, cause of all the symptoms and that that cause may reside in your gastrointestinal tract, perhaps impaired circulation to one or more of your viscera that would not be obvious on the esophagogastroduodenoscopy (EGD), or achalasia, where the muscle at the end of the esophagus does not relax enough for the passage to open properly causing swallowing difficulty.  By the way, pain that originates in the right upper abdomen and radiates to the shoulder is typical of gall bladder disease.

If all testing continues to be normal or negative, you and your doctors might want to consider this being some type of functional disorder.