Thanks for your question.
Guillain-Barré syndrome involves the peripheral nerves of the body.
The bodys' auto-immune system attacks the peripheral nerves.
Depending on which type of nerves are affected and which nerves are affected, the symptoms can vary.
If a sensory nerve
is affected, it can cause the patient to sense pain.
If a motor nerve (Those carrying signals to muscles) is affected, the particular muscle might be paralyzed.
The Celiac disease
and Renaud's phenomenon have nothing to do with your chest pain
. Chest pain is a recognised symptom of Guillain-Barré syndrome.
It is due to the pain that you might be feeling constricted. Please keep in mind that if you feel too breathless, please ask for assistance. It might need immediate attention.
Hope I could answer your question. Please feel free to get back to me if you have any further questions.