You're speaking with Dr. Michael Salkin. Welcome to JustAnswer. I'm currently typing up my reply.
Judy, if Bailey has been doing this for more than 72 hours, yes, your very expensive vet should take a look at him. Bailey's behavior is important but it's not pathognomonic (specifically indicative) of any one particular disorder. It doesn't sound as if he's nauseated because he continues to dive into his food but once the food reaches his stomach and/or esophagus it's stimulating the vomiting reflex. This occurs secondary to both functional problems such as dysfunctional cardio-esophageal or pyloric sphincters, inflammatory disorders - infectious, immune-mediated, or neoplastic - as well as foreign body ingestion (unexpected at Bailey's age) and disorders outside the gastrointestinal tract but affecting it.
I would expect a thorough physical exam including a senior/geriatric diagnostic panel of blood and urine tests (including a specCPL blood test which is most sensitive for detecting the presence of pancreatitis) to be performed and if nothing untoward were found in such testing, an abdominal ultrasound to be recommended.
Please respond with further questions or concerns if you wish.
Thank you for your kind accept. I appreciate it. May I have an update on Bailey, please?