I know someone who also recently thought he was having heart pains. The doctors ruled out a heart attack, and suggested that it was an esophageal contraction brought about by her digestive system.
Perhaps Limbaugh ate some really spicy foods, or just mixed incompatible cuisines between breakfast/lunch/dinner that caused an extreme gas attack?
-PJ
A year ago November I was drinking a very cold smoothie and suddenly had horrible chest pains, they were indicative of a heart attack, I was nauseated, cold sweats, etc... finally got my husband's attention, refused to let him call 911, he took my blood pressure and it was very low at the time, the pains continued for several hours and felt like an elephant on my chest... well, my husband made a doctors appointment for me and they did an EKG and another new test... showed nothing, so they sent me to the AZ Heart Institute and they did a Nuclear Stress Test and I had to go back for an echo cardiogram, finally determined there was nothing, not even a blockage... and likely a spasm caused by my lupus -- which can cause vascular spasms and feel like a heart attack....
There is so many things this could be.. certainly heart attack is one, but there is so many other things we just have to wait for what they decide to release.