...and I can empathize. I also agree with the advice given : get Aaron to a gastroenterologist at once. My daughter had gastirc reflux, and had to sleep in an infant seat for 6 mos, no lying down in case she aspirated, but there are now simple medications that can help. It was horrible to watch her grunt and writhe in pain. I'm sure unless it's a true dairy allergy you will be able to resume nursing. He may even have an anal tear if he has been constipated as well as having liquid stools.... good luck with him, and I am sure he will be just fine, but getting medical advice is important. Every baby is different.
It is so nice you an come here with a concern about your child !