Adding another thought that crossed my mind. My understanding is that the damage to the vagus nerve may cause gastroparesis. Dr Datis Kharrazian recommends the following (and slightly odd) "exercises" to re-activate the vagus nerve:
(1) singing loudly
(2) prolonged strong gargling - i.e. making a loud noise and prolonging as long as possible, preferably to the point of tears
(3) using tongue depressors to activate the gag reflex (governed by the vagus)
Have you tried the sugar-free gum that Dr Bernstein recommends after eating - seems like the simplest solution if it works - stimulating saliva and gastric function?My GI Dr said the same thing about the vagus nerve. I'll have to try those. Except #3. I'm sick often enough without making myself gag.