Oh, this is a common worry lah, especially during the glucose tolerance test (GTT) time, ramai mummies yang rasa loya or nak muntah after minum air tu. Mungkin you could try minum perlahan-lahan sikit, jangan terus habiskan sekaligus, and make sure perut tak terlalu kosong before you go. Kalau rasa loya tu memang teruk sangat, it's worth mentioning to your doctor or nurse beforehand because they may have some advice on how to make it a bit more comfortable for you. Do check with them first ya, they know your situation best and sure can guide you properly.