My son (16) has been having episodes of vomiting since he was 10. The episode last usually 3-4 days , he won't be able to have any food stay down and thrown it's like a switch.... it stops and he could eat whatever he wants. He tested positive for gluten allergy at 10 yr. He has had strep multiple times as a child and numerous ear infections. The reason I suspect PANDAS is that there seems to be a pattern of when the vomiting starts it is right after he complains of sore throats and achiness. His strep titer is elevated . I just had him at his doctor on Monday , she ran an overnight strep , so far it's negative . If anyone has been through something similar or has any information please let me know.