Is there a positive correlation between food allergies and dysautonomia?

No. Though food allergies are common, there has not been a clear cut relationship between allergies and dysautonomia. On the other hand, vitamin deficiencies, especially vitamin b1, are linked to this condition.
Food Allergies. There are no peer-reviewed scientific studies showing a correlation between the two, but that is not to say they do not exist. Food allergies can obviously exacerbate dysautonomia. Basically, if a food makes you feel worse, keep away from that class of foods.