my 26 year old son with severe autism ate lunch today with his usual appetite (linebacker) and the same food as the other family members. after about 4 or 5 hours he somehow decided to guzzle about 10 oz of soda and after a short while vomited for probably the second time in his entire life. The soda was cherry based, the vomit included undigested ground beef (from lunch) and while it had a red tinge to it it was the same red as the soda coloring. (vomiting blood is more likely obvious ). He is NOT exhibiting pain and while he is non-verbal, he is currently resting comfortably and making his normal speech sounds. the vomiting is NOT constant like dry heaving and i know to watch for dehydration. Am i over-reacting a bit and yes i know i need to probably seek more care if it continues every time he drinks or eats