I am 10 months out and I have only vomited 4 times. Not everyone does. I wish I had more severe reactions because I think I would be more diligent.
My usual indication that I've done something wrong is I feel extremely uncomfortable for an hour or two. Lately I notice I get
really tired when this happens and I can barely keep my eyes open. My "cure" when this happens is to try to be mobile, walking around seems to help me. It makes it pass faster. DH swears by jumping jacks when he gets the uncomfortable feeling.
Everyone is different when it comes to dumping and what works for you one week, may not work for you the next week.
This morning I had the smallest nibble of a sample cheese danish when I got my Latte this morning (damn Starbucks, I couldn't resist!) and I spent the next 2 hours paying for it. It was crazy because it wasn't more than a bite and it still threw my system into pandemonium. And yet the night before last I had a fairly large Starbuck's sugar cookie with M&M's and had no repercussions whatsoever.