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Hi, I'm Dr. Jill. I'm sorry to hear about your issues with your lab. While a variety of different issues could be causing the vomiting, one thing you can try at home is a dose of Pepcid (famotidine) before bed. If he has some acid reflux causing irritation in the morning, this may help. I would generally recommend 1 20mg tablet (the extra strength size) for a typical 60-70lb lab.
Food sensitivities can also cause vomiting, though usually I see diarrhea with that as well. Trying a novel protein diet (a protein source he's never had before like rabbit and green pea or venison and sweet potato) for a couple weeks as smaller, more frequent meals may help to see if this is an issue.
If he's not improving with this in a couple weeks, you may want to discuss running some basic bloodwork with your vet to rule out other internal issues. I hope this is helpful. If you have any additional questions please don't hesitate to ask. I would be happy to assist further in whatever way I can.