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:
How long has he had these signs?
Can you take a breathing rate for me (just count his breaths for 10 seconds + multiply by 6)?
Are his gums pink or pale/white? Sticky or moist?
Can he raise his head? Can he use all his legs normally?
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)?