Welcome to Healing Well! Damage to the vagus nerve is always a risk, but it is very rare. If you had your headaches long before your surgery. You said your surgery was 15 months ago...was that correct?
The retching can be a side effect, but it would be continuous, not just one time. Sometimes the vagus nerve can be irritated and that can create some temporary issues, but actual permanent damage is thankfully rare.
Glad you've joined us!
Nissen Fundoplication 2/09
Allergy/Asthma"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”