Your symptoms sound like cardiac vasospasms...and yes they can be caused by autonomic dysfunction. They are not easy to diagnose, so unless you have seen a cardiologist well versed in autonomic neuropathy, you might not get a proper diagnosis.

The spasms can cause the arteries to collapse for brief seconds causing pain in the center of the chest, upper chest, and mid back...along with SOB, jaw pain, arm pain or any other symptoms generally common with a heart attack. The difference is that the spasms are for very short periods where as a heart attack continues. Even though the spasms are short, they can repeat frequently during periods of autonomic dysfunction, so can last any where from minutes to on/off for hours.

There is no good diagnostic test. It is usually diagnosed by ruling out other causes yet observing subtle changes on EKG or stress echo. Yet it doesn't always show. One of the ways to diagnose, is to actually treat it (with nitro) and if the symptoms subside, then it is assumed to be spasm related...either cardiac or esophageal (both treated the same way). There is a test for esophageal spasms...called manometry. Pretty uncomfortable test but it will tell if you have spasms in the esophagus.

You should check your BP during these events as well. It might be a sign of your BP dropping. Other causes can be simple indigestion or gas.