Oh, i'm sorry. I can just feel your worry and concern!! I would be too. You have done everything that any caring parent would have for their bully. It's good you got the vet involved and have an appt. tomorrow should that be necessary. The view of his torso area may be just the angle you're looking at and d/t the fact that he vomited so much of his stomach contents that his tummy is just empty right now. You have to remind me but did Bogey get his full set of shots already?
Hoping he feels better soon. I'll keep him in my prayers.