Megaesophagus produces a quiet, non retching vomit. It is a distention of the lower esophagus, near the stomach, which becomes more a pouch than tube and collects food rather than passing it into the stomach.
You mentioned a noise like he is trying to work something out of his pharyngeal area, and white foamy vomitus. This white foam is thick saliva mixed with air, and it is quite 'clingy' to the back of the throat. Being a boxer, he has a built in propensity to nasal/pharyngeal congestion, with his shortened face.
I would wonder about a about of tonsillitis causing the throat congestion and difficulty swallowing, and a gagging on the thickened tonsils and saliva, producing the vomiting.
I, too, recommend a return to the vet's, plus a good look into his throat while the thermometer is up his rear, and possibly a course of antibiotics?
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