Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you with today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
Again I do apologize that my colleagues could not aid you sooner, but can you tell me:
Any gagging, retching, lip licking, drooling or vomiting?
Any sores, ulcers, blisters in his mouth? Any issues with his teeth?
Could he have eaten something he should not have (ie bones, toys, plants, chemicals, etc)?
Are his gums pink or pale/white? Moist or sticky?
If you press on his belly, does he have any discomfort, tenderness, or tensing?