continued chest discomfort

I have had this question for the doc forum for awhile but thought I'd try to post it here in hopes someone could shed some insight.  (And I'm not too consistant about trying to get into the other forum regularly!)

After experiencing chest discomfort last year I had the full run of tests.  I saw two cardios and my findings and results have been normal.  I do have questions on arrythmia and heart disease.

1. Is it likely that an arrythmia was missed on two event monitors and two holters?  Is the body able to

[tanns]

I have a unexplained chest discomfort too.  I've seen lots of docs including 3 cardios and one at the Mayo Clinic.  My tests are all normal.  What caught me about this post was the severe heartburn. I've been having that too.   I've seen that mentioned in here before but not really an answer for it.  I've seen a gastro doc too and they've seen nothing.  It really worries me because of it being seemingly "unexplained".  

Hope you get some answers!