Aisa is about 2 years old, and was bred to a buck 12 weeks ago (we're fairly sure she's pregnant). She has never had any issues, but suddenly started bloating on Dec.25th in the evening. When we got to her, she was vomiting white foam all over the goat shed. We treated with vegetable oil, then massaged and walked her, and she was better. We took her off grain for a few days (Noble Goat, which I recently switched to from Dumor Goat Pellets, because it was recommended to me for my other goat who has UC issues). She gets free-choice fescue hay, Golden Blend Minerals, Baking Soda, cut brush, and fresh water daily. Since that day, she has bloated every 4 to 5 days, always in the early evening. We've treated her with vegetable oil, milk of magnesia, probiotics. She flicks her tongue a lot, and the noises from her abdomen are extremely loud. Her droppings are normal. She does chew cud, but not as often as normal, and she seems to swallow it back down after she brings it up, instead of chewing. What could this be???