I am mixed feeding - he has 1-3 bottles a day. All has been fine until last week. He had his last round of injections and since then he has been very pukey an gassy. He is fine, playing and smiling then will yelp suddenly, throw up and start crying. Just now he has sick hen literally started screaming uncontrollably. I can often hear his stomach growling before this happens - it also sounds like a half filled hot water bottle! Apart from this is is fine in himself. Is it possible to develop reflux?