It sounds like your stomach is still very sensitive after surgery, which is completely normal. Vomiting after a sugar-free popsicle could be due to a few reasons. Cold sensitivity is common after VSG, and some people find that very cold foods or drinks trigger nausea or discomfort. Eating too quickly, even with soft foods or liquids, can also lead to vomiting, so it's important to take small sips or bites slowly. Sugar-free products often contain sugar alcohols or artificial sweeteners, which can sometimes upset the stomach or even cause mild dumping syndrome. Your stomach is also still healing, and certain foods or textures might irritate it. You might want to try letting the popsicle melt a little before consuming it, take smaller amounts, or switch to room-temperature or warm liquids to see if they sit better. If vomiting continues with other foods or liquids, it would be a good idea to check in with your surgeon to rule out any complications like a stricture or food intolerance.