Ay nako, na-experience ko rin yan after my tetanus shot, ang body talaga sometimes reacts badly sa vaccines, kaya don't worry ikaw lang yan! A few of my mum friends also had nausea at digestive upset after getting theirs, so it's actually pretty common, pero if it's super intense or hindi humihinto, mas better you check with your doctor just to be safe kasi baka need ng something to help settle your stomach.