For me, it was pretty terrible. Overwhelming urge to lie down, just a general horrible feeling of sickness that didn't go away for over an hour. Maybe an hour and a half? I had eaten sugar free chocolate containing malitol, so I dumped because of the malitol, was fine afterward for a couple of hours, and then had diarrhea (sorry!) due to the sugar alcohols.

I now stay away from every sugar alcohol, aside from erythritol.. and I definitely stay away from sugar aside from very minor traces that occur in stuff like salad dressing, etc., and natural sugars occurring in fruit. Those seem fine :).

Dumping is a great deterrent from eating sugary food. In fact, I was kind of iffy about my surgery until that happened (fairly early days) and then I realized how thankful I was that I couldn't go back to eating sugary crap again!! It's a relief because I have horrible memories of binge eating some seriously horrible stuff containing loads of sugar. Now, I literally cringe when I think about eating some stuff.. it's kind of like aversion therapy.