I wonder if its the blood moving from your arms and legs to your digestive tract after eating...kind of like when a person has a fever, the blood moves from the periphery to the core...and so the person feels cold.

As far as I know, with hypothyroidism, the hands and feet are almost always cold. I was diagnosed with hypothyroidism several years ago - even through I had few of the symptoms. Mostly I was exhausted, my doctor did a bunch of blood tests and put me on Synthroid. After a number of years, I started to get a bunch of other symptoms. I checked out Stop The Thyroid Madness web site. Now I am on Armour Thyroid and do not have any of the old Synthroid symptoms. There is also a web site called Synthroid Haters.

I think Helen is right about the shivers. DO you get the same effects on low carb food? If not, or you do not know, give it a try. I expect that "normal food" is high carb.

This is also linked to food intolerance

http://failsafediet.wordpress.com/about-food-chemical-intolerance/food-chemical-intolerance-symptoms/

Its your Vegas nerve an Peripheral nerves that control the anatomic function do to one or more hernias the Esophagus as well don't listen to all these stories I am a pro at this stuff