Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you 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 situation, and wanted to help.
Again I do apologize that my colleagues could not aid you sooner. If you would still like assistance, can you tell me:
Any retching, gagging, lip licking, drooling, or vomiting?
Are his gums nice and pink (not white/pale)? Moist or sticky?
If you press on his belly, does he have any tensing, tenderness, discomfort, or pain?
Could he have eaten anything he should not have (ie bones, toys, plants, chemicals, human meds, etc)?
Can you take a pulse rate for me (just count the beats for 10 seconds and multiply that by 6)?
Any discomfort with his bladder since these signs started or changes to his urination?
Any discharge, odor or redness in the ear?